diff --git a/src/SMDS/SMDS_VolumeTool.cxx b/src/SMDS/SMDS_VolumeTool.cxx
index d2cf317a7..a881eb9ac 100644
--- a/src/SMDS/SMDS_VolumeTool.cxx
+++ b/src/SMDS/SMDS_VolumeTool.cxx
@@ -1276,7 +1276,7 @@ bool SMDS_VolumeTool::IsFreeFace( int faceIndex )
         continue; // opposite side
     }
     // remove a volume from volNbShared map
-    volNbShared.erase( vNbIt );
+    volNbShared.erase( vNbIt-- );
   }
 
   // here volNbShared contains only volumes laying on the