diff --git a/testing/btest/opt/coalescence.zeek b/testing/btest/opt/coalescence.zeek
index 9552c168ba..3b95b4bffb 100644
--- a/testing/btest/opt/coalescence.zeek
+++ b/testing/btest/opt/coalescence.zeek
@@ -1,4 +1,5 @@
 # @TEST-DOC: Ensure that event coalescence works properly.
+# @TEST-REQUIRES: test "${ZEEK_USE_CPP}" != "1"
 #
 # @TEST-EXEC: zeek -b -O ZAM %INPUT >output
 # @TEST-EXEC: btest-diff output
diff --git a/testing/btest/opt/no-coalescence.zeek b/testing/btest/opt/no-coalescence.zeek
index 2bd87bd413..3475108812 100644
--- a/testing/btest/opt/no-coalescence.zeek
+++ b/testing/btest/opt/no-coalescence.zeek
@@ -1,4 +1,5 @@
 # @TEST-DOC: Ensure that event coalescence doesn't happen if inlining turned off.
+# @TEST-REQUIRES: test "${ZEEK_USE_CPP}" != "1"
 #
 # @TEST-EXEC: zeek -b -O ZAM -O no-inline %INPUT >output
 # @TEST-EXEC: btest-diff output