diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
index f64ab91c432b..e8f777830a23 100644
--- a/tools/perf/util/expr.c
+++ b/tools/perf/util/expr.c
@@ -1,6 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <stdbool.h>
 #include <assert.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
 #include "expr.h"
 #include "expr-bison.h"
 #include "expr-flex.h"