diff --git a/util/mcgg/scan.l b/util/mcgg/scan.l
index d6a60d361..d26dfac81 100644
--- a/util/mcgg/scan.l
+++ b/util/mcgg/scan.l
@@ -1,5 +1,6 @@
 %{
 #include <stdbool.h>
+#include <stdint.h>
 #include "iburg.h"
 #include "y.tab.h"