diff --git a/src/libhs/monitor_win32.c b/src/libhs/monitor_win32.c
index ea689f0..ff98703 100644
--- a/src/libhs/monitor_win32.c
+++ b/src/libhs/monitor_win32.c
@@ -1241,7 +1241,7 @@ static LRESULT __stdcall window_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM
         } break;
     }
 
-    return DefWindowProc(hwnd, msg, wparam, lparam);
+    return DefWindowProcA(hwnd, msg, wparam, lparam);
 }
 
 static void unregister_monitor_class(void)