diff --git a/tools/tracing/rtla/src/actions.c b/tools/tracing/rtla/src/actions.c
index aaf0808125d7..eab51c0c0ce2 100644
--- a/tools/tracing/rtla/src/actions.c
+++ b/tools/tracing/rtla/src/actions.c
@@ -131,7 +131,7 @@ actions_parse(struct actions *self, const char *trigger)
 {
 	enum action_type type = ACTION_NONE;
 	char *token;
-	char trigger_c[strlen(trigger)];
+	char trigger_c[strlen(trigger) + 1];
 
 	/* For ACTION_SIGNAL */
 	int signal = 0, pid = 0;