diff --git a/client.cpp b/client.cpp
--- a/client.cpp
+++ b/client.cpp
@@ -77,6 +77,12 @@
                            XCB_EVENT_MASK_STRUCTURE_NOTIFY |
                            XCB_EVENT_MASK_SUBSTRUCTURE_REDIRECT;
 
+// window types that are supported as normal windows (i.e. KWin actually manages them)
+const NET::WindowTypes SUPPORTED_MANAGED_WINDOW_TYPES_MASK = NET::NormalMask | NET::DesktopMask | NET::DockMask
+        | NET::ToolbarMask | NET::MenuMask | NET::DialogMask /*| NET::OverrideMask*/ | NET::TopMenuMask
+        | NET::UtilityMask | NET::SplashMask | NET::NotificationMask | NET::OnScreenDisplayMask
+        | NET::CriticalNotificationMask;
+
 // Creating a client:
 //  - only by calling Workspace::createClient()
 //      - it creates a new client and calls manage() for it
diff --git a/unmanaged.cpp b/unmanaged.cpp
--- a/unmanaged.cpp
+++ b/unmanaged.cpp
@@ -35,6 +35,13 @@
 namespace KWin
 {
 
+// window types that are supported as unmanaged (mainly for compositing)
+const NET::WindowTypes SUPPORTED_UNMANAGED_WINDOW_TYPES_MASK = NET::NormalMask | NET::DesktopMask | NET::DockMask
+        | NET::ToolbarMask | NET::MenuMask | NET::DialogMask /*| NET::OverrideMask*/ | NET::TopMenuMask
+        | NET::UtilityMask | NET::SplashMask | NET::DropdownMenuMask | NET::PopupMenuMask
+        | NET::TooltipMask | NET::NotificationMask | NET::ComboBoxMask | NET::DNDIconMask | NET::OnScreenDisplayMask
+        | NET::CriticalNotificationMask;
+
 Unmanaged::Unmanaged()
     : Toplevel()
 {
diff --git a/utils.h b/utils.h
--- a/utils.h
+++ b/utils.h
@@ -27,8 +27,6 @@
 #include <kwinconfig.h>
 // kwin
 #include <kwinglobals.h>
-// KDE
-#include <netwm_def.h>
 // Qt
 #include <QLoggingCategory>
 #include <QList>
@@ -43,18 +41,6 @@
 namespace KWin
 {
 
-// window types that are supported as normal windows (i.e. KWin actually manages them)
-const NET::WindowTypes SUPPORTED_MANAGED_WINDOW_TYPES_MASK = NET::NormalMask | NET::DesktopMask | NET::DockMask
-        | NET::ToolbarMask | NET::MenuMask | NET::DialogMask /*| NET::OverrideMask*/ | NET::TopMenuMask
-        | NET::UtilityMask | NET::SplashMask | NET::NotificationMask | NET::OnScreenDisplayMask
-        | NET::CriticalNotificationMask;
-// window types that are supported as unmanaged (mainly for compositing)
-const NET::WindowTypes SUPPORTED_UNMANAGED_WINDOW_TYPES_MASK = NET::NormalMask | NET::DesktopMask | NET::DockMask
-        | NET::ToolbarMask | NET::MenuMask | NET::DialogMask /*| NET::OverrideMask*/ | NET::TopMenuMask
-        | NET::UtilityMask | NET::SplashMask | NET::DropdownMenuMask | NET::PopupMenuMask
-        | NET::TooltipMask | NET::NotificationMask | NET::ComboBoxMask | NET::DNDIconMask | NET::OnScreenDisplayMask
-        | NET::CriticalNotificationMask;
-
 const QPoint invalidPoint(INT_MIN, INT_MIN);
 
 class Toplevel;