diff --git a/clients/nitrogen/config/nitrogenconfigurationui.cpp b/clients/nitrogen/config/nitrogenconfigurationui.cpp
index 103cc8b113..540eb9b1e7 100644
--- a/clients/nitrogen/config/nitrogenconfigurationui.cpp
+++ b/clients/nitrogen/config/nitrogenconfigurationui.cpp
@@ -45,6 +45,7 @@ namespace Nitrogen
     frameBorder(0),
     blendColor(0),
     sizeGripMode(0),
+    titleOutline(0),
     drawSeparator(0)
   { setupUI(); }