diff -up texinfo-6.4/info/info-utils.c.orig texinfo-6.4/info/info-utils.c
--- texinfo-6.4/info/info-utils.c.orig	2017-07-10 10:37:50.713333292 +0200
+++ texinfo-6.4/info/info-utils.c	2017-07-10 10:38:16.342348756 +0200
@@ -1280,6 +1280,7 @@ scan_reference_label (REFERENCE *entry,
                                 &entry->nodename);
       if (!len)
         return 0; /* Input invalid. */
+      canonicalize_whitespace (entry->nodename);
       label_len += len;
     }
   else