diff --git a/source/utils/CarlaPluginUI.cpp b/source/utils/CarlaPluginUI.cpp
index e6826798f..2241ceb1c 100644
--- a/source/utils/CarlaPluginUI.cpp
+++ b/source/utils/CarlaPluginUI.cpp
@@ -277,7 +277,7 @@ private:
 
 typedef void (*EventProcPtr)(XEvent* ev);
 
-static const int X11Key_Escape = 9;
+static const uint X11Key_Escape = 9;
 static bool gErrorTriggered = false;
 
 static int temporaryErrorHandler(Display*, XErrorEvent*)