diff --git a/rtengine/iptransform.cc b/rtengine/iptransform.cc
index aee7ae4e4..8aa471c0b 100644
--- a/rtengine/iptransform.cc
+++ b/rtengine/iptransform.cc
@@ -524,7 +524,11 @@ bool ImProcFunctions::transCoord (int W, int H, const std::vector<Coord2D> &src,
         x_d /= params->perspective.camera_scale;
         y_d /= params->perspective.camera_scale;
         if (params->perspective.camera_defish) {
-            const double focal_source = params->perspective.camera_focal_length * maxRadius * focal_length_in_px_factor;
+            const double focal_source =
+                    params->perspective.camera_focal_length *
+                    maxRadius *
+                    focal_length_in_px_factor *
+                    params->perspective.camera_crop_factor;
             double focal_dst = focal_source;
             x_d /= focal_dst;
             y_d /= focal_dst;
@@ -1264,7 +1268,11 @@ void ImProcFunctions::transformGeneral(bool highQuality, Imagefloat *original, I
             x_d /= params->perspective.camera_scale;
             y_d /= params->perspective.camera_scale;
             if (params->perspective.camera_defish) {
-                const double focal_source = params->perspective.camera_focal_length * maxRadius * focal_length_in_px_factor;
+                const double focal_source =
+                        params->perspective.camera_focal_length *
+                        maxRadius *
+                        focal_length_in_px_factor *
+                        params->perspective.camera_crop_factor;
                 double focal_dst = focal_source;
                 x_d /= focal_dst;
                 y_d /= focal_dst;