diff --git a/abstract_client.h b/abstract_client.h
--- a/abstract_client.h
+++ b/abstract_client.h
@@ -348,7 +348,7 @@
      * @see captionNormal
      * @see captionSuffix
      **/
-    virtual QString caption(bool full = true) const = 0;
+    QString caption(bool full = true) const;
     /**
      * @returns The caption as set by the AbstractClient without any suffix.
      * @see caption
diff --git a/abstract_client.cpp b/abstract_client.cpp
--- a/abstract_client.cpp
+++ b/abstract_client.cpp
@@ -1766,4 +1766,17 @@
     return workspace()->findAbstractClient(fetchNameInternalPredicate);
 }
 
+QString AbstractClient::caption(bool full) const
+{
+    QString cap = captionNormal();
+    if (full) {
+        cap += captionSuffix();
+        if (unresponsive()) {
+            cap += QLatin1String(" ");
+            cap += i18nc("Application is not responding, appended to window title", "(Not Responding)");
+        }
+    }
+    return cap;
+}
+
 }
diff --git a/client.h b/client.h
--- a/client.h
+++ b/client.h
@@ -219,7 +219,6 @@
     void setBlockingCompositing(bool block);
     inline bool isBlockingCompositing() { return blocks_compositing; }
 
-    QString caption(bool full = true) const override;
     QString captionNormal() const override {
         return cap_normal;
     }
diff --git a/client.cpp b/client.cpp
--- a/client.cpp
+++ b/client.cpp
@@ -1496,22 +1496,6 @@
     }
 }
 
-/**
- * \reimp
- */
-QString Client::caption(bool full) const
-{
-    QString cap = cap_normal;
-    if (full) {
-        cap += cap_suffix;
-        if (unresponsive()) {
-            cap += QLatin1String(" ");
-            cap += i18nc("Application is not responding, appended to window title", "(Not Responding)");
-        }
-    }
-    return cap;
-}
-
 bool Client::tabTo(Client *other, bool behind, bool activate)
 {
     Q_ASSERT(other && other != this);
diff --git a/shell_client.h b/shell_client.h
--- a/shell_client.h
+++ b/shell_client.h
@@ -63,7 +63,6 @@
     }
 
     void blockActivityUpdates(bool b = true) override;
-    QString caption(bool full = true) const override;
     QString captionNormal() const override {
         return m_caption;
     }
diff --git a/shell_client.cpp b/shell_client.cpp
--- a/shell_client.cpp
+++ b/shell_client.cpp
@@ -561,15 +561,6 @@
     Q_UNUSED(b)
 }
 
-QString ShellClient::caption(bool full) const
-{
-    QString caption = m_caption;
-    if (full) {
-        caption += m_captionSuffix;
-    }
-    return caption;
-}
-
 void ShellClient::updateCaption()
 {
     const QString oldSuffix = m_captionSuffix;