diff --git a/clients/plastik/plastikclient.cpp b/clients/plastik/plastikclient.cpp
index 3730f7607d..14a9dcf73e 100644
--- a/clients/plastik/plastikclient.cpp
+++ b/clients/plastik/plastikclient.cpp
@@ -103,10 +103,13 @@ void PlastikClient::init()
     widget()->update(titleSpacer_->geometry());
 }
 
+const int SUPPORTED_WINDOW_TYPES_MASK = NET::NormalMask | NET::DesktopMask | NET::DockMask
+    | NET::ToolbarMask | NET::MenuMask | NET::DialogMask | NET::OverrideMask | NET::TopMenuMask
+    | NET::UtilityMask | NET::SplashMask;
+
 bool PlastikClient::isTool()
 {
-    NET::WindowType type = windowType(NET::NormalMask|NET::ToolbarMask|
-                                      NET::UtilityMask|NET::MenuMask);
+    NET::WindowType type = windowType( SUPPORTED_WINDOW_TYPES_MASK );
     return ((type==NET::Toolbar)||(type==NET::NET::Utility)||(type==NET::Menu));
 }
 
diff --git a/clients/quartz/quartz.cpp b/clients/quartz/quartz.cpp
index 34d1fd5011..e98d4b178c 100644
--- a/clients/quartz/quartz.cpp
+++ b/clients/quartz/quartz.cpp
@@ -556,9 +556,13 @@ void QuartzClient::reset( unsigned long changed )
 	}
 }
 
+const int SUPPORTED_WINDOW_TYPES_MASK = NET::NormalMask | NET::DesktopMask | NET::DockMask
+    | NET::ToolbarMask | NET::MenuMask | NET::DialogMask | NET::OverrideMask | NET::TopMenuMask
+    | NET::UtilityMask | NET::SplashMask;
+
 bool QuartzClient::isTool()
 {
-	NET::WindowType type = windowType(NET::NormalMask|NET::ToolbarMask|NET::UtilityMask|NET::MenuMask);
+	NET::WindowType type = windowType( SUPPORTED_WINDOW_TYPES_MASK );
 	return ((type==NET::Toolbar)||(type==NET::NET::Utility)||(type==NET::Menu));
 }
 
diff --git a/clients/web/Web.cpp b/clients/web/Web.cpp
index cb99b6dfae..48dd404e68 100644
--- a/clients/web/Web.cpp
+++ b/clients/web/Web.cpp
@@ -554,9 +554,13 @@ QSize WebClient::minimumSize() const
     return QSize( 200, 50 );
 }
 
+const int SUPPORTED_WINDOW_TYPES_MASK = NET::NormalMask | NET::DesktopMask | NET::DockMask
+    | NET::ToolbarMask | NET::MenuMask | NET::DialogMask | NET::OverrideMask | NET::TopMenuMask
+    | NET::UtilityMask | NET::SplashMask;
+
 bool WebClient::isTool()
 {
-  NET::WindowType type = windowType(NET::NormalMask|NET::ToolbarMask|NET::UtilityMask|NET::MenuMask);
+  NET::WindowType type = windowType( SUPPORTED_WINDOW_TYPES_MASK );
   return ((type==NET::Toolbar)||(type==NET::NET::Utility)||(type==NET::Menu));
 }