diff --git a/rtengine/LUT.h b/rtengine/LUT.h
index de668cca8..9f16995d0 100644
--- a/rtengine/LUT.h
+++ b/rtengine/LUT.h
@@ -444,7 +444,7 @@ public:
             }
 
             idx = 0;
-        } else if (idx > maxs) {
+        } else if (index > maxsf) {
             if (clip & LUT_CLIP_ABOVE) {
                 return data[upperBound];
             }