diff --git a/src/os_mswin.c b/src/os_mswin.c
index 256da04..f06583c 100644
--- a/src/os_mswin.c
+++ b/src/os_mswin.c
@@ -92,6 +92,7 @@
 typedef int HICON;
 typedef int HWND;
 typedef int INPUT_RECORD;
+typedef int INT_PTR;
 typedef int KEY_EVENT_RECORD;
 typedef int LOGFONTW;
 typedef int LPARAM;