diff --git a/CHANGES b/CHANGES
index 62b103f7fc..317fbb1021 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,13 @@
 
+2.5-551 | 2018-05-01 18:27:38 -0500
+
+  * Fix the ip-broken-header.bro test on macOS due to missing 'xzcat'
+    (Daniel Thayer)
+
+  * Improve reliability of the logging rotate.bro test (Daniel Thayer)
+
+  * Improve reliability of missing-file-initially.bro test (Daniel thayer)
+
 2.5-547 | 2018-05-01 18:17:14 -0500
 
   * Update install instructions for Ubuntu 18.04 (Daniel Thayer)
diff --git a/VERSION b/VERSION
index 60705092ed..98f5b14c58 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.5-547
+2.5-551
diff --git a/testing/btest/Baseline/scripts.base.frameworks.input.missing-file-initially/bro..stdout b/testing/btest/Baseline/scripts.base.frameworks.input.missing-file-initially/bro..stdout
index 39309bc8cf..3d47249011 100644
--- a/testing/btest/Baseline/scripts.base.frameworks.input.missing-file-initially/bro..stdout
+++ b/testing/btest/Baseline/scripts.base.frameworks.input.missing-file-initially/bro..stdout
@@ -1,5 +1,5 @@
-now it does
-and more!
-now it does
-and more!
-Streaming still works
+input: now it does
+input: and more!
+inputstream: now it does
+inputstream: and more!
+inputstream: Streaming still works
diff --git a/testing/btest/Traces/trunc/mpls-6in6-broken.pcap.gz b/testing/btest/Traces/trunc/mpls-6in6-broken.pcap.gz
new file mode 100644
index 0000000000..af717b19c4
Binary files /dev/null and b/testing/btest/Traces/trunc/mpls-6in6-broken.pcap.gz differ
diff --git a/testing/btest/Traces/trunc/mpls-6in6-broken.pcap.xz b/testing/btest/Traces/trunc/mpls-6in6-broken.pcap.xz
deleted file mode 100644
index f45d0a9a17..0000000000
Binary files a/testing/btest/Traces/trunc/mpls-6in6-broken.pcap.xz and /dev/null differ
diff --git a/testing/btest/core/ip-broken-header.bro b/testing/btest/core/ip-broken-header.bro
index 48a90d2821..426e7a7bc0 100644
--- a/testing/btest/core/ip-broken-header.bro
+++ b/testing/btest/core/ip-broken-header.bro
@@ -1,7 +1,7 @@
 # This test has a trace that was generated from fuzzing which used to cause
 # OOB reads in Bro. It has a number of packets broken in weird ways.
 #
-# @TEST-EXEC: xzcat $TRACES/trunc/mpls-6in6-broken.pcap.xz | bro -C -b -r - %INPUT
+# @TEST-EXEC: gunzip -c $TRACES/trunc/mpls-6in6-broken.pcap.gz | bro -C -b -r - %INPUT
 # @TEST-EXEC: btest-diff weird.log
 
 @load base/frameworks/notice/weird.bro
diff --git a/testing/btest/scripts/base/frameworks/input/missing-file-initially.bro b/testing/btest/scripts/base/frameworks/input/missing-file-initially.bro
index 4db255b69d..5b7baed4f9 100644
--- a/testing/btest/scripts/base/frameworks/input/missing-file-initially.bro
+++ b/testing/btest/scripts/base/frameworks/input/missing-file-initially.bro
@@ -4,8 +4,11 @@
 # failing behavior.
 
 # @TEST-EXEC: btest-bg-run bro bro %INPUT
-# @TEST-EXEC: sleep 2; cp does-exist.dat does-not-exist.dat
-# @TEST-EXEC: sleep 2; mv does-not-exist.dat does-not-exist-again.dat; echo "Streaming still works" >> does-not-exist-again.dat
+# @TEST-EXEC: sleep 10
+# @TEST-EXEC: mv does-exist.dat does-not-exist.dat
+# @TEST-EXEC: sleep 2
+# @TEST-EXEC: mv does-not-exist.dat does-not-exist-again.dat
+# @TEST-EXEC: echo "Streaming still works" >> does-not-exist-again.dat
 # @TEST-EXEC: btest-bg-wait -k 3
 # @TEST-EXEC: btest-diff bro/.stdout
 # @TEST-EXEC: TEST_DIFF_CANONIFIER=$SCRIPTS/diff-sort btest-diff bro/.stderr
@@ -30,7 +33,7 @@ type Val: record {
 
 event line(description: Input::EventDescription, tpe: Input::Event, v: Val)
 	{
-	print v$line;
+	print fmt("%s: %s", description$name, v$line);
 	}
 
 event line2(description: Input::EventDescription, tpe: Input::Event, v: Val)
diff --git a/testing/btest/scripts/base/frameworks/logging/rotate.bro b/testing/btest/scripts/base/frameworks/logging/rotate.bro
index 86f659c193..501c0db8ea 100644
--- a/testing/btest/scripts/base/frameworks/logging/rotate.bro
+++ b/testing/btest/scripts/base/frameworks/logging/rotate.bro
@@ -1,5 +1,6 @@
 #
-# @TEST-EXEC: bro -b -r ${TRACES}/rotation.trace %INPUT 2>&1 | grep "test" >out
+# @TEST-EXEC: bro -b -r ${TRACES}/rotation.trace %INPUT >bro.out 2>&1
+# @TEST-EXEC: grep "test" bro.out | sort >out
 # @TEST-EXEC: for i in `ls test.*.log | sort`; do printf '> %s\n' $i; cat $i; done >>out
 # @TEST-EXEC: btest-diff out