diff --git a/kwin/rules.cpp b/kwin/rules.cpp
index a2c43a18..d651d5b7 100644
--- a/kwin/rules.cpp
+++ b/kwin/rules.cpp
@@ -134,6 +134,7 @@ static int limit0to4(int i)
 
 void Rules::readFromCfg(const KConfigGroup& cfg)
 {
+    ruleid = cfg.readEntry("id", QByteArray());
     description = cfg.readEntry("Description");
     if (description.isEmpty())  // capitalized first, lowercase for backwards compatibility
         description = cfg.readEntry("description");
@@ -232,6 +233,7 @@ void Rules::readFromCfg(const KConfigGroup& cfg)
 
 void Rules::write(KConfigGroup& cfg) const
 {
+    cfg.writeEntry("id", ruleid);
     cfg.writeEntry("Description", description);
     // always write wmclass
     WRITE_MATCH_STRING(wmclass, (const char*), true);
@@ -972,21 +974,32 @@ void RuleBook::edit(Client* c, bool whole_app)
 void RuleBook::load()
 {
     deleteAll();
+    QList<QByteArray> ruleids;
     KConfig cfg("kwinrulesrc", KConfig::NoGlobals);
     int count = cfg.group("General").readEntry("count", 0);
     for (int i = 1; i <= count; ++i) {
         KConfigGroup cg(&cfg, QString::number(i));
+        const QByteArray id = cg.readEntry("id", QByteArray());
+        if (ruleids.contains(id)) {
+            continue;
+        }
         Rules* rule = new Rules(cg);
         m_rules.append(rule);
+        ruleids.append(id);
     }
     const QStringList kwinrules = KGlobal::dirs()->findAllResources("data", "kwin/default_rules/*.kwinrules");
     foreach (const QString &kwinrule, kwinrules) {
         KConfig cfg(kwinrule, KConfig::NoGlobals);
-        int count = cfg.group("General").readEntry("count", 0);
+        count = cfg.group("General").readEntry("count", 0);
         for (int i = 1; i <= count; ++i) {
             KConfigGroup cg(&cfg, QString::number(i));
+            const QByteArray id = cg.readEntry("id", QByteArray());
+            if (ruleids.contains(id)) {
+                continue;
+            }
             Rules* rule = new Rules(cg);
             m_rules.append(rule);
+            ruleids.append(id);
         }
     }
 }
diff --git a/kwin/rules.h b/kwin/rules.h
index 7b42a422..91a912f0 100644
--- a/kwin/rules.h
+++ b/kwin/rules.h
@@ -199,6 +199,7 @@ private:
     static bool checkForceStop(ForceRule rule);
 #endif
     int temporary_state; // e.g. for kstart
+    QByteArray ruleid;
     QString description;
     QByteArray wmclass;
     StringMatch wmclassmatch;
diff --git a/plasma/containments/desktop/plasma_desktop_containment.kwinrules b/plasma/containments/desktop/plasma_desktop_containment.kwinrules
index c79725b3..ad014e1b 100644
--- a/plasma/containments/desktop/plasma_desktop_containment.kwinrules
+++ b/plasma/containments/desktop/plasma_desktop_containment.kwinrules
@@ -11,4 +11,4 @@ types=32
 wmclass=plasma
 wmclasscomplete=false
 wmclassmatch=1
-
+id=191497c49c1ad8700a041a08f204df2e6a6a2a97