diff --git a/tests/test_versions/test.sh b/tests/test_versions/test.sh
index a168aa1f12b03dd9f01e66eddb01301238bbdfc0..8543dafbb663ec37e8ce1f4182e9aaf0885da147 100755
--- a/tests/test_versions/test.sh
+++ b/tests/test_versions/test.sh
@@ -10,7 +10,7 @@ if which ack &>/dev/null; then
   __SEARCH_COMMAND__="ack --passthru"
 else
   echo "ack is not installed; defaulting to grep, but note that the log will be missing the IOC log" >&2
-  __SEARCH_COMMAND__="grep -E"
+  __SEARCH_COMMAND__="grep -P"
 fi
 
 function usage {