diff --git a/tools/perf/util/print-events.c b/tools/perf/util/print-events.c
index 4bbcdbf05b84..cb27e2898aa0 100644
--- a/tools/perf/util/print-events.c
+++ b/tools/perf/util/print-events.c
@@ -97,14 +97,9 @@ void print_sdt_events(const struct print_callbacks *print_cb, void *print_state)
 		} else {
 			next_sdt_name = strlist__next(sdt_name);
 			if (next_sdt_name) {
-				char *bid2 = strchr(next_sdt_name->s, '@');
+				const char *bid2 = strchrnul(next_sdt_name->s, '@');
 
-				if (bid2)
-					*bid2 = '\0';
-				if (strcmp(sdt_name->s, next_sdt_name->s) == 0)
-					show_detail = true;
-				if (bid2)
-					*bid2 = '@';
+				show_detail = strncmp(sdt_name->s, next_sdt_name->s, bid2 - next_sdt_name->s) == 0;
 			}
 		}
 		last_sdt_name = sdt_name->s;