diff --git a/toolkit/source/controls/unocontrolcontainer.cxx b/toolkit/source/controls/unocontrolcontainer.cxx
index fe396930d6c4..af2cbb5a3687 100644
--- a/toolkit/source/controls/unocontrolcontainer.cxx
+++ b/toolkit/source/controls/unocontrolcontainer.cxx
@@ -356,7 +356,7 @@ private:
     uno::Reference< awt::XControlContainer > mxControlContainer;
 
 public:
-    explicit DialogStepChangedListener( uno::Reference< awt::XControlContainer > xControlContainer )
+    explicit DialogStepChangedListener( uno::Reference< awt::XControlContainer > const & xControlContainer )
         : mxControlContainer( xControlContainer ) {}
 
     // XEventListener