diff --git a/dtool/src/parser-inc/string b/dtool/src/parser-inc/string
index d27aaf783f..841e6fd7c6 100644
--- a/dtool/src/parser-inc/string
+++ b/dtool/src/parser-inc/string
@@ -22,6 +22,7 @@
 
 #include <stdtypedefs.h>
 #include <cwchar>
+#include <stdint.h>
 
 namespace std {
   template<class charT> struct char_traits;