diff --git a/testsuite/tests/rts/all.T b/testsuite/tests/rts/all.T
index aeaf1505768c06772647cf33e7703d9ad4532599..9c68260e60adb652875a6a40eab5fca558012b47 100644
--- a/testsuite/tests/rts/all.T
+++ b/testsuite/tests/rts/all.T
@@ -216,10 +216,6 @@ test('EventlogOutput_IPE',
      ],
      makefile_test, ['EventlogOutput_IPE'])
 
-# Remove the capability prefix from IPE event log lines.
-def noCapabilityOutputFilter(s):
-     return re.sub(r'[a-f0-9]+: IPE:', 'IPE:', s)
-
 test('T4059', req_c, makefile_test, ['T4059'])
 
 # Test for #4274
diff --git a/testsuite/tests/rts/ipe/all.T b/testsuite/tests/rts/ipe/all.T
index 15af42f58888b476f052a27a74b60eb605c3a3e5..ca8d2eef9954fa91f886bb63779744a1b9953904 100644
--- a/testsuite/tests/rts/ipe/all.T
+++ b/testsuite/tests/rts/ipe/all.T
@@ -1,3 +1,7 @@
+# Remove the capability prefix from IPE event log lines.
+def noCapabilityOutputFilter(s):
+     return re.sub(r'[a-f0-9]+: IPE:', 'IPE:', s)
+
 test('ipeMap', [extra_files(['ipe_lib.c', 'ipe_lib.h']), c_src], compile_and_run, ['ipe_lib.c'])
 
 # Manually create IPE entries and dump them to event log (stderr).
@@ -30,4 +34,3 @@ test('ipeEventLog_fromMap',
        when(opsys('darwin'), fragile(0))
      ],
      compile_and_run, ['ipe_lib.c'])
-