diff --git a/kcmkwin/kwinrules/detectwidget.cpp b/kcmkwin/kwinrules/detectwidget.cpp
index b92bd151a8..a921e2173c 100644
--- a/kcmkwin/kwinrules/detectwidget.cpp
+++ b/kcmkwin/kwinrules/detectwidget.cpp
@@ -55,7 +55,7 @@ void DetectDialog::detect( WId window )
         readWindow( window );
     }
 
-static QCString getStringProperty(WId w, Atom prop, char separator=0)
+static QCString getStringProperty(WId w, Atom prop, char separator)
     {
     Atom type;
     int format, status;
diff --git a/utils.h b/utils.h
index f02b7b7e28..c881ddeeea 100644
--- a/utils.h
+++ b/utils.h
@@ -161,7 +161,7 @@ class KWinSelectionOwner
     };
 
 
-QCString getStringProperty(WId w, Atom prop, char separator=0);
+static QCString getStringProperty(WId w, Atom prop, char separator=0);
 void updateXTime();
 void grabXServer();
 void ungrabXServer();