diff --git a/data/skeletons/yacc.c b/data/skeletons/yacc.c
index f910f713..0fc0c9e5 100644
--- a/data/skeletons/yacc.c
+++ b/data/skeletons/yacc.c
@@ -547,7 +547,7 @@ void free (void *); /* INFRINGES ON USER NAME SPACE */
 #  endif
 # endif]b4_lac_if([[
 # define YYCOPY_NEEDED 1]])[
-#endif]b4_lac_if([], [b4_parse_error_case([simple], [[/* !defined yyoverflow */]])])[
+#endif /* ]b4_lac_if([[1]], [b4_parse_error_case([simple], [[!defined yyoverflow]], [[1]])])[ */
 
 #if (! defined yyoverflow \
      && (! defined __cplusplus \
diff --git a/src/parse-gram.c b/src/parse-gram.c
index ee6da6bc..f4f1c708 100644
--- a/src/parse-gram.c
+++ b/src/parse-gram.c
@@ -529,7 +529,7 @@ void free (void *); /* INFRINGES ON USER NAME SPACE */
 #  endif
 # endif
 # define YYCOPY_NEEDED 1
-#endif
+#endif /* 1 */
 
 #if (! defined yyoverflow \
      && (! defined __cplusplus \