diff --git a/rtengine/rtthumbnail.cc b/rtengine/rtthumbnail.cc
index 1ffaf939a..2c78e84bf 100644
--- a/rtengine/rtthumbnail.cc
+++ b/rtengine/rtthumbnail.cc
@@ -1483,29 +1483,33 @@ IImage8* Thumbnail::processImage (const procparams::ProcParams& params, eSensorT
     delete labView;
     delete baseImg;
 
-    /*
-    // calculate scale
-    if (params.coarse.rotate == 90 || params.coarse.rotate == 270) {
-        myscale = scale * thumbImg->getWidth() / fh;
-    } else {
-        myscale = scale * thumbImg->getHeight() / fh;
-    }
 
-    myscale = 1.0 / myscale;
+
     // apply crop
     if (params.crop.enabled) {
+        double lscale;
+        // calculate scale
+        if (params.coarse.rotate == 90 || params.coarse.rotate == 270) {
+            lscale = scale * thumbImg->getWidth() / fh;
+        } else {
+            lscale = scale * thumbImg->getHeight() / fh;
+        }
+
+        lscale = 1.0 / lscale;
         int ix = 0;
-        for (int i=0; i<fh; i++)
-            for (int j=0; j<fw; j++)
-                if (i<params.crop.y/myscale || i>(params.crop.y+params.crop.h)/myscale || j<params.crop.x/myscale || j>(params.crop.x+params.crop.w)/myscale) {
+        for (int i = 0; i < fh; ++i) {
+            for (int j = 0; j < fw; ++j) {
+                if (i < params.crop.y * lscale || i > (params.crop.y + params.crop.h) * lscale || j < params.crop.x * lscale || j > (params.crop.x + params.crop.w) * lscale) {
                     readyImg->data[ix++] /= 3;
                     readyImg->data[ix++] /= 3;
                     readyImg->data[ix++] /= 3;
-                }
-                else
+                } else {
                     ix += 3;
+                }
+            }
+        }
     }
-    */
+
 
     return readyImg;
 }