diff --git a/src/win32_window.c b/src/win32_window.c
index ff591440..0eebcf01 100644
--- a/src/win32_window.c
+++ b/src/win32_window.c
@@ -43,6 +43,11 @@
 typedef UINT64 QWORD; // Needed for NEXTRAWINPUTBLOCK()
 #endif
 
+#ifndef RI_MOUSE_HWHEEL
+// MinGW may not have the define for RI_MOUSE_HWHEEL
+#define RI_MOUSE_HWHEEL 0x0800
+#endif
+
 
 // Returns the window style for the specified window
 //