diff --git a/source/bsp.h b/source/bsp.h
index bec60ee3e..2a66831e8 100644
--- a/source/bsp.h
+++ b/source/bsp.h
@@ -20,6 +20,8 @@
 
 #pragma once
 
+#include <stdint.h>
+
 #include <string>
 
 constexpr const char *AJBSP_VERSION = "1.05";