diff --git a/src/common/platform/posix/cocoa/i_input.mm b/src/common/platform/posix/cocoa/i_input.mm
index 8b81f86ad..dad875fba 100644
--- a/src/common/platform/posix/cocoa/i_input.mm
+++ b/src/common/platform/posix/cocoa/i_input.mm
@@ -46,6 +46,7 @@
 #include "i_interface.h"
 #include "menustate.h"
 #include "engineerrors.h"
+#include "keydef.h"
 
 
 EXTERN_CVAR(Int, m_use_mouse)