diff --git a/vcg/simplex/face/topology.h b/vcg/simplex/face/topology.h
index 42fd44ec..93e1e833 100644
--- a/vcg/simplex/face/topology.h
+++ b/vcg/simplex/face/topology.h
@@ -24,6 +24,9 @@
   History
 
 $Log: not supported by cvs2svn $
+Revision 1.19  2005/11/10 15:49:32  cignoni
+Made IsManifold Constant
+
 Revision 1.18  2005/10/13 08:34:19  cignoni
 Removed reference to IsBorder() member of face and substituted with the face templated function version.
 
@@ -302,7 +305,7 @@ static void FlipEdge(FaceType &f, const int z)
 {	
 	assert(z>=0);
 	assert(z<3);
-	assert( !f.IsBorder(z) );
+	assert( !IsBorder(f,z) );
 	assert( face::IsManifold<FaceType>(f, z));
 
  	FaceType *g = f.FFp(z);