diff --git a/lib/asn1/der_get.c b/lib/asn1/der_get.c
index 0ea816c79..a8bb5c097 100644
--- a/lib/asn1/der_get.c
+++ b/lib/asn1/der_get.c
@@ -260,3 +260,15 @@ decode_generalized_time (unsigned char *p, int len, time_t *t)
   free (k.data);
   return ret;
 }
+
+
+int
+fix_dce(int reallen, int *len)
+{
+    if(reallen == 0)
+	return 1;
+    if(*len < reallen)
+	return -1;
+    *len = reallen;
+    return 0;
+}