diff --git a/lib/asn1/main.c b/lib/asn1/main.c
index 507c61776..bda45f843 100644
--- a/lib/asn1/main.c
+++ b/lib/asn1/main.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997 Kungliga Tekniska Högskolan
+ * Copyright (c) 1997, 1998, 1999 Kungliga Tekniska Högskolan
  * (Royal Institute of Technology, Stockholm, Sweden). 
  * All rights reserved. 
  *
@@ -50,6 +50,7 @@ main(int argc, char **argv)
     char *name = NULL;
 
     if (argc == 1) {
+	file = "stdin";
 	name = "stdin";
 	yyin = stdin;
     } else {