diff --git a/tools/perf/util/branch.h b/tools/perf/util/branch.h
index 4d3f02fa223d..17b2ccc61094 100644
--- a/tools/perf/util/branch.h
+++ b/tools/perf/util/branch.h
@@ -46,7 +46,7 @@ struct branch_entry {
 struct branch_stack {
 	u64			nr;
 	u64			hw_idx;
-	struct branch_entry	entries[0];
+	struct branch_entry	entries[];
 };
 
 /*