diff --git a/src/gui/Window.h b/src/gui/Window.h
index 182da2f..7f1e7b9 100644
--- a/src/gui/Window.h
+++ b/src/gui/Window.h
@@ -27,7 +27,7 @@ protected:
         CURSOR_EOL,
     };
 
-    enum
+    enum : uint32_t
     {
         KEYMOD_CTRL  = 0x10000,
         KEYMOD_ALT   = 0x20000,