diff --git a/tools/perf/tests/shell/coresight/thread_loop_check_tid_10.sh b/tools/perf/tests/shell/coresight/thread_loop_check_tid_10.sh
index 7c13636fc778..c83a200dede4 100755
--- a/tools/perf/tests/shell/coresight/thread_loop_check_tid_10.sh
+++ b/tools/perf/tests/shell/coresight/thread_loop_check_tid_10.sh
@@ -5,7 +5,7 @@
 # Carsten Haitzler <carsten.haitzler@arm.com>, 2021
 
 TEST="thread_loop"
-. $(dirname $0)/../lib/coresight.sh
+. "$(dirname $0)"/../lib/coresight.sh
 ARGS="10 1"
 DATV="check-tid-10th"
 DATA="$DATD/perf-$TEST-$DATV.data"