diff --git a/Source/Core/VideoBackends/Null/PerfQuery.h b/Source/Core/VideoBackends/Null/PerfQuery.h
index 54a2d03cdb..ce6ba7263e 100644
--- a/Source/Core/VideoBackends/Null/PerfQuery.h
+++ b/Source/Core/VideoBackends/Null/PerfQuery.h
@@ -18,7 +18,7 @@ public:
   void ResetQuery() override {}
   u32 GetQueryResult(PerfQueryType type) override { return 0; }
   void FlushResults() override {}
-  bool IsFlushed() const { return true; }
+  bool IsFlushed() const override { return true; }
 };
 
 }  // namespace