diff --git a/mercurial/store.py b/mercurial/store.py
--- a/mercurial/store.py
+++ b/mercurial/store.py
@@ -482,7 +482,9 @@
                 pass
 
         if chunk:
-            raise error.Abort(_("fncache does not ends with a newline"))
+            raise error.Abort(_("fncache does not ends with a newline"),
+                              hint=_("use 'hg debugrebuildfncache' to rebuild"
+                                     " the fncache"))
         self._checkentries(fp)
         fp.close()