diff --git a/testing/btest/core/div-by-zero.zeek b/testing/btest/core/div-by-zero.zeek
index 1d0f7013ca..56feb278d6 100644
--- a/testing/btest/core/div-by-zero.zeek
+++ b/testing/btest/core/div-by-zero.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b %INPUT >out 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b %INPUT >out 2>&1
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff out
 
 event div_int(a: int, b: int)
diff --git a/testing/btest/core/expr-exception.zeek b/testing/btest/core/expr-exception.zeek
index 4cbb4b1c47..27fcbad5a2 100644
--- a/testing/btest/core/expr-exception.zeek
+++ b/testing/btest/core/expr-exception.zeek
@@ -2,7 +2,7 @@
 # shouldn't abort Zeek entirely, but just return from the function body.
 #
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -r $TRACES/wikipedia.trace %INPUT >output
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -r $TRACES/wikipedia.trace %INPUT >output
 # @TEST-EXEC: TEST_DIFF_CANONIFIER="$SCRIPTS/diff-remove-abspath | $SCRIPTS/diff-remove-timestamps" btest-diff reporter.log
 # @TEST-EXEC: btest-diff output
 
diff --git a/testing/btest/core/reporter-error-in-handler.zeek b/testing/btest/core/reporter-error-in-handler.zeek
index 1b13c0ddbe..3ec9eac280 100644
--- a/testing/btest/core/reporter-error-in-handler.zeek
+++ b/testing/btest/core/reporter-error-in-handler.zeek
@@ -3,7 +3,7 @@
 # than looping indefinitly, the error inside the handler should reported to stderr.
 #
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek %INPUT >output 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek %INPUT >output 2>&1
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff output
 
 global a: table[count] of count;
diff --git a/testing/btest/core/when-interpreter-exceptions.zeek b/testing/btest/core/when-interpreter-exceptions.zeek
index f70bb39ea4..fb6c0d1f3b 100644
--- a/testing/btest/core/when-interpreter-exceptions.zeek
+++ b/testing/btest/core/when-interpreter-exceptions.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" btest-bg-run zeek "zeek -b %INPUT >output 2>&1"
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" btest-bg-run zeek "zeek -b %INPUT >output 2>&1"
 # @TEST-EXEC: btest-bg-wait 30
 # @TEST-EXEC: TEST_DIFF_CANONIFIER="$SCRIPTS/diff-remove-abspath | $SCRIPTS/diff-remove-timestamps | $SCRIPTS/diff-sort" btest-diff zeek/output
 
diff --git a/testing/btest/language/common-mistakes.zeek b/testing/btest/language/common-mistakes.zeek
index 6b8701b877..694dbe3ad2 100644
--- a/testing/btest/language/common-mistakes.zeek
+++ b/testing/btest/language/common-mistakes.zeek
@@ -3,13 +3,13 @@
 # of the current event handler body.
 
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b 1.zeek >1.out 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b 1.zeek >1.out 2>&1
 # @TEST-EXEC: btest-diff 1.out
 
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b 2.zeek >2.out 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b 2.zeek >2.out 2>&1
 # @TEST-EXEC: btest-diff 2.out
 
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b 3.zeek >3.out 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b 3.zeek >3.out 2>&1
 # @TEST-EXEC: btest-diff 3.out
 
 @TEST-START-FILE 1.zeek
diff --git a/testing/btest/language/copy-cycle.zeek b/testing/btest/language/copy-cycle.zeek
index edda97547c..04dc5c3883 100644
--- a/testing/btest/language/copy-cycle.zeek
+++ b/testing/btest/language/copy-cycle.zeek
@@ -1,6 +1,6 @@
 # TODO: There's explicitly a reference cycle being created in this test that
 # causes a memory leak, so just disable leak checking.
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b %INPUT >out
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b %INPUT >out
 # @TEST-EXEC: btest-diff out
 
 type B: record {
diff --git a/testing/btest/language/expire-expr-error.zeek b/testing/btest/language/expire-expr-error.zeek
index 907d5b8460..ac47d37d41 100644
--- a/testing/btest/language/expire-expr-error.zeek
+++ b/testing/btest/language/expire-expr-error.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b %INPUT
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b %INPUT
 # @TEST-EXEC: cp .stderr output
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff output
 
diff --git a/testing/btest/language/expire-func-undef.zeek b/testing/btest/language/expire-func-undef.zeek
index dba8f6c873..9828fc886c 100644
--- a/testing/btest/language/expire-func-undef.zeek
+++ b/testing/btest/language/expire-func-undef.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -r $TRACES/rotation.trace -b %INPUT >output 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -r $TRACES/rotation.trace -b %INPUT >output 2>&1
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff output
 
 module segfault; 
diff --git a/testing/btest/language/index-assignment-invalid.zeek b/testing/btest/language/index-assignment-invalid.zeek
index ad7bc38384..947168f64c 100644
--- a/testing/btest/language/index-assignment-invalid.zeek
+++ b/testing/btest/language/index-assignment-invalid.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b %INPUT >output 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b %INPUT >output 2>&1
 # @TEST-EXEC: grep "error" output >output2
 # @TEST-EXEC: for i in 1 2 3 4 5; do cat output2 | cut -d'|' -f$i >>out; done
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff out
diff --git a/testing/btest/language/invalid_index.zeek b/testing/btest/language/invalid_index.zeek
index e55d691520..a1cbe4c868 100644
--- a/testing/btest/language/invalid_index.zeek
+++ b/testing/btest/language/invalid_index.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b %INPUT >out 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b %INPUT >out 2>&1
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff out
 
 global foo: vector of count = { 42 };
diff --git a/testing/btest/language/subnet-errors.zeek b/testing/btest/language/subnet-errors.zeek
index 4968e381ec..d0c9fd6aa4 100644
--- a/testing/btest/language/subnet-errors.zeek
+++ b/testing/btest/language/subnet-errors.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b %INPUT >out 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b %INPUT >out 2>&1
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff out
 
 event zeek_init()
diff --git a/testing/btest/language/type-cast-error-dynamic.zeek b/testing/btest/language/type-cast-error-dynamic.zeek
index 3ae4cfcb6b..443cd1acc8 100644
--- a/testing/btest/language/type-cast-error-dynamic.zeek
+++ b/testing/btest/language/type-cast-error-dynamic.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b %INPUT >output 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b %INPUT >output 2>&1
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff output
 
 type X: record  {
diff --git a/testing/btest/language/type-coerce-numerics.zeek b/testing/btest/language/type-coerce-numerics.zeek
index 3e7c919f16..2c1a2eb241 100644
--- a/testing/btest/language/type-coerce-numerics.zeek
+++ b/testing/btest/language/type-coerce-numerics.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b first_set.zeek >first_set.out 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b first_set.zeek >first_set.out 2>&1
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff first_set.out
 
 # @TEST-EXEC-FAIL: zeek -b double_convert_failure1.zeek >double_convert_failure1.out 2>&1
diff --git a/testing/btest/language/uninitialized-local2.zeek b/testing/btest/language/uninitialized-local2.zeek
index 8d270cc041..d5f8eb7cec 100644
--- a/testing/btest/language/uninitialized-local2.zeek
+++ b/testing/btest/language/uninitialized-local2.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek -b %INPUT >out 2>&1
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek -b %INPUT >out 2>&1
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff out
 
 event test()
diff --git a/testing/btest/plugins/reporter-hook.zeek b/testing/btest/plugins/reporter-hook.zeek
index 7d1f2b1093..6619d98224 100644
--- a/testing/btest/plugins/reporter-hook.zeek
+++ b/testing/btest/plugins/reporter-hook.zeek
@@ -2,7 +2,7 @@
 # @TEST-EXEC: cp -r %DIR/reporter-hook-plugin/* .
 # @TEST-EXEC: ./configure --zeek-dist=${DIST} && make
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" ZEEK_PLUGIN_ACTIVATE="Reporter::Hook" ZEEK_PLUGIN_PATH=`pwd` zeek -b %INPUT 2>&1 | $SCRIPTS/diff-remove-abspath | sort | uniq  >output
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" ZEEK_PLUGIN_ACTIVATE="Reporter::Hook" ZEEK_PLUGIN_PATH=`pwd` zeek -b %INPUT 2>&1 | $SCRIPTS/diff-remove-abspath | sort | uniq  >output
 # @TEST-EXEC: btest-diff output
 # @TEST-EXEC: TEST_DIFF_CANONIFIER="$SCRIPTS/diff-remove-abspath | $SCRIPTS/diff-remove-timestamps" btest-diff reporter.log
 
diff --git a/testing/btest/scripts/base/frameworks/reporter/disable-stderr.zeek b/testing/btest/scripts/base/frameworks/reporter/disable-stderr.zeek
index 0f1b48bab7..803308dbb6 100644
--- a/testing/btest/scripts/base/frameworks/reporter/disable-stderr.zeek
+++ b/testing/btest/scripts/base/frameworks/reporter/disable-stderr.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek %INPUT
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek %INPUT
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff .stderr
 # @TEST-EXEC: TEST_DIFF_CANONIFIER="$SCRIPTS/diff-remove-abspath | $SCRIPTS/diff-remove-timestamps" btest-diff reporter.log
 
diff --git a/testing/btest/scripts/base/frameworks/reporter/stderr.zeek b/testing/btest/scripts/base/frameworks/reporter/stderr.zeek
index bfbecc206f..c1af87d9ad 100644
--- a/testing/btest/scripts/base/frameworks/reporter/stderr.zeek
+++ b/testing/btest/scripts/base/frameworks/reporter/stderr.zeek
@@ -1,5 +1,5 @@
 # TODO: interpreter exceptions currently may cause memory leaks, so disable leak checks
-# @TEST-EXEC: ASAN_OPTIONS="detect_leaks=0" zeek %INPUT
+# @TEST-EXEC: ASAN_OPTIONS="$ASAN_OPTIONS,detect_leaks=0" zeek %INPUT
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-remove-abspath btest-diff .stderr
 # @TEST-EXEC: TEST_DIFF_CANONIFIER="$SCRIPTS/diff-remove-abspath | $SCRIPTS/diff-remove-timestamps" btest-diff reporter.log