diff --git a/tabbox/clientmodel.h b/tabbox/clientmodel.h
index 131cf29845..4178a5d065 100644
--- a/tabbox/clientmodel.h
+++ b/tabbox/clientmodel.h
@@ -36,7 +36,6 @@ namespace KWin
 namespace TabBox
 {
 
-class TabBoxConfig;
 
 /**
 * The model for TabBoxClients used in TabBox.
diff --git a/tabbox/desktopmodel.h b/tabbox/desktopmodel.h
index e25bd33ac3..f8242402bb 100644
--- a/tabbox/desktopmodel.h
+++ b/tabbox/desktopmodel.h
@@ -35,7 +35,6 @@ namespace KWin
 namespace TabBox
 {
 class ClientModel;
-class TabBoxConfig;
 
 /**
 * The model for desktops used in TabBox.