diff --git a/src/gui/idletimer.h b/src/gui/idletimer.h
index d3cc847e..649b8a07 100644
--- a/src/gui/idletimer.h
+++ b/src/gui/idletimer.h
@@ -7,6 +7,7 @@ public:
     virtual inline bool isSupported() const {
         return true;
     }
+    virtual ~IdleTimerImpl() = default;
 };
 
 class IdleTimer