diff --git a/tools/testing/selftests/bpf/vmtest.sh b/tools/testing/selftests/bpf/vmtest.sh
index 976ef7585b335a60abc3c35936ee7bc0388f7a63..a29aa05ebb3e98cc64129ca8bcb7fe30de17e20c 100755
--- a/tools/testing/selftests/bpf/vmtest.sh
+++ b/tools/testing/selftests/bpf/vmtest.sh
@@ -333,7 +333,7 @@ main()
 	local exit_command="poweroff -f"
 	local debug_shell="no"
 
-	while getopts 'hskid:j:' opt; do
+	while getopts ':hskid:j:' opt; do
 		case ${opt} in
 		i)
 			update_image="yes"