diff --git a/rtengine/imagefloat.h b/rtengine/imagefloat.h
index bd7ae2a46..cb0792dc5 100644
--- a/rtengine/imagefloat.h
+++ b/rtengine/imagefloat.h
@@ -218,7 +218,7 @@ public:
         return (uint32_t) ((sign << 31) | (exponent << 23) | mantissa);
     }
 
-    virtual void         normalizeFloat(float srcMinVal, float srcMaxVal);
+    void                 normalizeFloat(float srcMinVal, float srcMaxVal) override;
     void                 normalizeFloatTo1();
     void                 normalizeFloatTo65535();
     void                 calcCroppedHistogram(const ProcParams &params, float scale, LUTu & hist);