diff --git a/uk/ac/sanger/artemis/util/DatabaseDocument.java b/uk/ac/sanger/artemis/util/DatabaseDocument.java
index aad59f035e61f26034fb11e08944030270847ddf..1211964162c31ad5fd9c92136a6391e2a94c5e48 100644
--- a/uk/ac/sanger/artemis/util/DatabaseDocument.java
+++ b/uk/ac/sanger/artemis/util/DatabaseDocument.java
@@ -3109,6 +3109,9 @@ public class DatabaseDocument extends Document
         FeatureLoc onPolyPepLoc = (FeatureLoc)featureLocsBySrcFeatureId.get(i);
         onPolyPepLoc.setFmin(onPolyPepLoc.getFmin() -
             (newFeatureLoc.getFmin() - oldFeatureLoc.getFmin()));
+        
+        onPolyPepLoc.setFmax(onPolyPepLoc.getFmax() -
+            (newFeatureLoc.getFmin() - oldFeatureLoc.getFmin()));
         dao.merge(onPolyPepLoc);
       }
     }