diff --git a/src/base64.h b/src/base64.h
index 92dc565e65eb1c..b4ab030dae842c 100644
--- a/src/base64.h
+++ b/src/base64.h
@@ -6,6 +6,7 @@
 #include "util.h"
 
 #include <stddef.h>
+#include <stdint.h>
 
 namespace node {
 //// Base 64 ////