diff --git a/info/scan.c b/info/scan.c
index 4b7dfe8754..007498dabc 100644
--- a/info/scan.c
+++ b/info/scan.c
@@ -1135,7 +1135,7 @@ scan_reference_label (REFERENCE *entry, int in_index)
       len = read_quoted_string (inptr + label_len, ":", max_lines,
                                 &entry->nodename);
       canonicalize_whitespace (entry->nodename);
-      if (!len)
+      if (!len && !entry->filename)
         return 0; /* Input invalid. */
       label_len += len;
     }