diff --git a/data/skeletons/bison.m4 b/data/skeletons/bison.m4
index 0375c755..6d92e4f9 100644
--- a/data/skeletons/bison.m4
+++ b/data/skeletons/bison.m4
@@ -402,7 +402,7 @@ b4_define_flag_if([yacc])               # Whether POSIX Yacc is emulated.
 # b4_glr_cc_if([IF-TRUE], [IF-FALSE])
 # -----------------------------------
 m4_define([b4_glr_cc_if],
-          [m4_if(m4_bregexp(b4_skeleton, [^"glr2?.cc"$]), [0], $@)])
+          [m4_if(m4_bregexp(b4_skeleton, [^"glr.cc"$]), [0], $@)])
 
 
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