diff --git a/fallback.h b/fallback.h
index 3d4e0a81e..e3952ec3a 100644
--- a/fallback.h
+++ b/fallback.h
@@ -3,6 +3,7 @@
 #define FISH_FALLBACK_H
 
 #include <stdio.h>
+#include <stdint.h>
 #include <stdarg.h>
 #include <wctype.h>
 #include <wchar.h>