diff --git a/distrho/src/DistrhoPluginJACK.cpp b/distrho/src/DistrhoPluginJACK.cpp
index f4347698..20ed6e5d 100644
--- a/distrho/src/DistrhoPluginJACK.cpp
+++ b/distrho/src/DistrhoPluginJACK.cpp
@@ -231,6 +231,9 @@ public:
 #else
         while (! gCloseSignalReceived)
             d_sleep(1);
+
+        // unused
+        (void)winId;
 #endif
     }