diff --git a/tests/experimental/delete_bykey.phpt b/tests/experimental/delete_bykey.phpt
index 64d49d0..1face45 100644
--- a/tests/experimental/delete_bykey.phpt
+++ b/tests/experimental/delete_bykey.phpt
@@ -37,4 +37,4 @@ A BAD KEY WAS PROVIDED/CHARACTERS OUT OF RANGE
 bool(false)
 NOT FOUND
 bool(false)
-%rPROTOCOL ERROR|NOT FOUND%r
+%rPROTOCOL ERROR|NOT FOUND|WRITE FAILURE%r