diff --git a/src/script/squirrel.hpp b/src/script/squirrel.hpp
--- a/src/script/squirrel.hpp
+++ b/src/script/squirrel.hpp
@@ -12,6 +12,8 @@
 #ifndef SQUIRREL_HPP
 #define SQUIRREL_HPP
 
+#include <squirrel.h>
+
 class Squirrel {
 private:
 	typedef void (SQPrintFunc)(bool error_msg, const SQChar *message);