diff --git a/rtengine/ipvibrance.cc b/rtengine/ipvibrance.cc
index 3e6ff97f2..1d152c737 100644
--- a/rtengine/ipvibrance.cc
+++ b/rtengine/ipvibrance.cc
@@ -59,9 +59,7 @@ void fillCurveArrayVib(DiagonalCurve* diagCurve, LUTf &outCurve)
             outCurve[i] = 65535.f * diagCurve->getVal( double(i) / 65535.0 );
         }
     } else {
-        for (int i = 0; i <= 0xffff; i++) {
-            outCurve[i] = float(i);
-        }
+        outCurve.makeIdentity();
     }
 }