diff --git a/kcmkwin/kwinrules/Makefile.am b/kcmkwin/kwinrules/Makefile.am
index 798ceaf25f..f987e58f14 100644
--- a/kcmkwin/kwinrules/Makefile.am
+++ b/kcmkwin/kwinrules/Makefile.am
@@ -2,6 +2,8 @@ METASOURCES = AUTO
 AM_CPPFLAGS = $(all_includes) -DKCMRULES
 INCLUDES = -I$(top_srcdir)/kwin/lib
 
+KDE_OPTIONS = nofinal
+
 kde_module_LTLIBRARIES = kcm_kwinrules.la 
 
 kcm_kwinrules_la_SOURCES = main.cpp ruleswidget.cpp ruleslist.cpp kwinsrc.cpp detectwidget.cpp \
diff --git a/kcmkwin/kwinrules/detectwidget.cpp b/kcmkwin/kwinrules/detectwidget.cpp
index a921e2173c..b92bd151a8 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)
+static QCString getStringProperty(WId w, Atom prop, char separator=0)
     {
     Atom type;
     int format, status;