diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 2e637e4c951d0f68e26844e14ce0d4bc11232770..f686d5ff594e6b93c6e6f732e7a1c97aa18c4e49 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -416,6 +416,8 @@ static void print_interval(void)
 		list_for_each_entry(counter, &evsel_list->entries, node)
 			print_counter_aggr(counter, prefix);
 	}
+
+	fflush(output);
 }
 
 static void handle_initial_delay(void)