diff --git a/src/kicontheme.h b/src/kicontheme.h
--- a/src/kicontheme.h
+++ b/src/kicontheme.h
@@ -288,7 +288,8 @@
      *
      * @deprecated since 5.64, no longer necessary, Qt assigns icon itself by now.
      */
-    KICONTHEMES_DEPRECATED_VERSION(5, 64, "No longer necessary") static void assignIconsToContextMenu(ContextMenus type, QList<QAction *> actions); // TODO KF6 remove
+    KICONTHEMES_DEPRECATED_VERSION(5, 64, "No longer necessary")
+    static void assignIconsToContextMenu(ContextMenus type, QList<QAction *> actions); // TODO KF6 remove
 #endif
 
 private:
diff --git a/src/kicontheme.cpp b/src/kicontheme.cpp
--- a/src/kicontheme.cpp
+++ b/src/kicontheme.cpp
@@ -677,6 +677,7 @@
     return QStringLiteral("hicolor");
 }
 
+#if KICONTHEMES_BUILD_DEPRECATED_SINCE(5, 64)
 void KIconTheme::assignIconsToContextMenu(ContextMenus type,
         QList<QAction *> actions)
 {
@@ -710,6 +711,7 @@
         break;
     }
 }
+#endif
 
 /*** KIconThemeDir ***/