diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 66386ba1425f323af82d7e0fe5d3aedd3b4136bd..5b03b9a869bba07f1fb0b1a860e4c8dea26620a4 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1316,8 +1316,8 @@ static int synth_event_create(int argc, const char **argv)
 
 	/* This interface accepts group name prefix */
 	if (strchr(name, '/')) {
-		len = sizeof(SYNTH_SYSTEM "/") - 1;
-		if (strncmp(name, SYNTH_SYSTEM "/", len))
+		len = str_has_prefix(name, SYNTH_SYSTEM "/");
+		if (len == 0)
 			return -EINVAL;
 		name += len;
 	}