Index: /issm/trunk-jpl/src/m/classes/mask.py
===================================================================
--- /issm/trunk-jpl/src/m/classes/mask.py	(revision 15433)
+++ /issm/trunk-jpl/src/m/classes/mask.py	(revision 15434)
@@ -59,5 +59,5 @@
 		if numpy.any(numpy.logical_not(numpy.isnan(md.diagnostic.icefront))):
 			pos=md.diagnostic.icefront[:,:-2]
-			icelevelset[pos[:]-1]=0;
+			icelevelset[pos[:].astype(int)-1]=0;
 		WriteData(fid,'data',icelevelset,'format','DoubleMat','mattype',1,'enum',IcelevelsetEnum())
 	# }}}