diff -Naurp nwchem-6.6.orig/src/util/nwc_const.fh nwchem-6.6/src/util/nwc_const.fh
--- nwchem-6.6.orig/src/util/nwc_const.fh	2015-10-01 17:33:14.000000000 +0000
+++ nwchem-6.6/src/util/nwc_const.fh	2015-11-26 10:53:46.386110924 +0000
@@ -62,7 +62,7 @@
 * Maximum number of unique tags
 *
       integer nw_max_unq_tags
-      parameter (nw_max_unq_tags = 40)
+      parameter (nw_max_unq_tags = nw_max_atom)
 *------------------------------------------------------------------------------
 * Maximum number of general contractions in a shell
 *