diff --git a/src/RageUtil_AutoPtr.h b/src/RageUtil_AutoPtr.h
index 61fd723828..d4505ea00d 100644
--- a/src/RageUtil_AutoPtr.h
+++ b/src/RageUtil_AutoPtr.h
@@ -3,6 +3,8 @@
 #ifndef RAGE_UTIL_AUTO_PTR_H
 #define RAGE_UTIL_AUTO_PTR_H
 
+#include <utility>
+
 /*
  * This is a simple copy-on-write refcounted smart pointer.  Once constructed, all read-only
  * access to the object is made without extra copying.  If you need read-write access, you