diff --git a/tools/perf/tests/shell/stat_all_pmu.sh b/tools/perf/tests/shell/stat_all_pmu.sh
index 2de7fd0394fdfe0c93d325b42c6c61f725950013..b30dba455f36c665227b2d90c26112f48fdb5974 100755
--- a/tools/perf/tests/shell/stat_all_pmu.sh
+++ b/tools/perf/tests/shell/stat_all_pmu.sh
@@ -7,11 +7,11 @@ set -e
 for p in $(perf list --raw-dump pmu); do
   echo "Testing $p"
   result=$(perf stat -e "$p" true 2>&1)
-  if [[ ! "$result" =~ "$p" ]] && [[ ! "$result" =~ "<not supported>" ]]; then
+  if ! echo "$result" | grep -q "$p" && ! echo "$result" | grep -q "<not supported>" ; then
     # We failed to see the event and it is supported. Possibly the workload was
     # too small so retry with something longer.
     result=$(perf stat -e "$p" perf bench internals synthesize 2>&1)
-    if [[ ! "$result" =~ "$p" ]]; then
+    if ! echo "$result" | grep -q "$p" ; then
       echo "Event '$p' not printed in:"
       echo "$result"
       exit 1