diff --git a/tests/vfsThread.test b/tests/vfsThread.test
index cbd947d..66ff5ba 100644
--- a/tests/vfsThread.test
+++ b/tests/vfsThread.test
@@ -534,6 +534,7 @@ test cookfsVfsThread-7.3 "VFS terminated while other thread opens a file for rea
     # We accept multiple results. The exact result depends on the state
     # of the thread when the VFS was unmounted
     assertMatchAny [thread::send $tid [list set result]] {
+        {1 {couldn't open "*": bad file number}}
         {1 {couldn't open "*": no locks available}}
         {1 {couldn't open "*": not a directory}}
         {1 {couldn't open "*": no such file or directory}}
@@ -585,6 +586,7 @@ test cookfsVfsThread-7.4 "VFS terminated while other thread opens a file for rea
     vwait thread_done
     # let's retrieve the results
     assertMatchAny [thread::send $tid [list set result]] {
+        {1 {couldn't open "*": bad file number}}
         {1 {couldn't open "*": no locks available}}
         {1 {couldn't open "*": not a directory}}
         {1 {couldn't open "*": no such file or directory}}