diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 77291cc4f5..a79696f758 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -284,6 +284,8 @@ static inline XTextProperty* qstringToXTP(Display *dpy, const QString& s)
         free_prop = false;
 #if QT_CONFIG(textcodec)
     }
+#else
+    Q_UNUSED(dpy);
 #endif
     return &tp;
 }