diff --git a/rtengine/demosaic_algos.cc b/rtengine/demosaic_algos.cc
index d83b90cef..16c0204dd 100644
--- a/rtengine/demosaic_algos.cc
+++ b/rtengine/demosaic_algos.cc
@@ -4213,7 +4213,7 @@ void RawImageSource::rcd_demosaic()
         }
     }
 
-    border_interpolate2(width, height, 4);
+    border_interpolate2(width, height, 8);
 
     if (plistener) {
         plistener->setProgress(1);