diff --git a/rules.cpp b/rules.cpp
index 07bbab1e83..3b463fc520 100644
--- a/rules.cpp
+++ b/rules.cpp
@@ -988,7 +988,7 @@ WindowRules RuleBook::find(const Client* c, bool ignore_temporary)
     return WindowRules(ret);
 }
 
-void RuleBook::edit(Client* c, bool whole_app)
+void RuleBook::edit(AbstractClient* c, bool whole_app)
 {
     save();
     QStringList args;
diff --git a/rules.h b/rules.h
index eb1a077736..b6c2d3f8da 100644
--- a/rules.h
+++ b/rules.h
@@ -38,6 +38,7 @@ class KXMessages;
 namespace KWin
 {
 
+class AbstractClient;
 class Client;
 class Rules;
 
@@ -292,7 +293,7 @@ public:
     void setUpdatesDisabled(bool disable);
     bool areUpdatesDisabled() const;
     void load();
-    void edit(Client* c, bool whole_app);
+    void edit(AbstractClient* c, bool whole_app);
     void requestDiskStorage();
 private Q_SLOTS:
     void temporaryRulesMessage(const QString&);