diff --git a/rtengine/xtrans_demosaic.cc b/rtengine/xtrans_demosaic.cc
index e84b5217e..9a3b341cc 100644
--- a/rtengine/xtrans_demosaic.cc
+++ b/rtengine/xtrans_demosaic.cc
@@ -959,7 +959,7 @@ void RawImageSource::xtrans_interpolate (const int passes, const bool useCieLab,
         free(buffer);
     }
 
-    xtransborder_interpolate(8, red, green, blue);
+    xtransborder_interpolate(passes > 1 ? 8 : 11, red, green, blue);
 }
 #undef CLIP
 void RawImageSource::fast_xtrans_interpolate (const array2D<float> &rawData, array2D<float> &red, array2D<float> &green, array2D<float> &blue)