diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index a7bc645ed..bd4160e42 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2014-07-03  Corinna Vinschen  <corinna@vinschen.de>
+
+	* fhandler_disk_file.cc (fhandler_disk_file::fstatvfs): Add debug
+	output.
+
 2014-06-25  Corinna Vinschen  <corinna@vinschen.de>
 
 	* errno.cc (errmap): Fix order of SERVICE_REQUEST_TIMEOUT.
diff --git a/winsup/cygwin/fhandler_disk_file.cc b/winsup/cygwin/fhandler_disk_file.cc
index ac8116486..428d04c45 100644
--- a/winsup/cygwin/fhandler_disk_file.cc
+++ b/winsup/cygwin/fhandler_disk_file.cc
@@ -800,6 +800,10 @@ fhandler_disk_file::fstatvfs (struct statvfs *sfs)
 	}
       ret = 0;
     }
+  else
+    debug_printf ("%y = NtQueryVolumeInformationFile"
+		  "(%S, FileFsFullSizeInformation)", 
+		  status, pc.get_nt_native_path ());
 out:
   if (opened)
     NtClose (fh);