--- a/tests/test-largefiles.t	Fri Jul 20 22:10:52 2012 -0400
+++ b/tests/test-largefiles.t	Sun Jul 22 13:16:45 2012 +0200
@@ -1128,7 +1128,8 @@
   $ cd ..
 
 putlfile errors are shown (issue3123)
-Corrupt the cached largefile in r7
+Corrupt the cached largefile in r7 and in the usercache (required for testing on vfat)
+  $ echo corruption > "$TESTTMP/r7/.hg/largefiles/4cdac4d8b084d0b599525cf732437fb337d422a8"
   $ echo corruption > "$USERCACHE/4cdac4d8b084d0b599525cf732437fb337d422a8"
   $ hg init empty
   $ hg serve -R empty -d -p $HGPORT1 --pid-file hg.pid \