diff --git a/tests/qemu-iotests/common.filter b/tests/qemu-iotests/common.filter
index 0ee6042524..f870e00e44 100644
--- a/tests/qemu-iotests/common.filter
+++ b/tests/qemu-iotests/common.filter
@@ -221,7 +221,6 @@ _filter_nbd()
     # Filter out the TCP port number since this changes between runs.
     $SED -e '/nbd\/.*\.c:/d' \
         -e 's#127\.0\.0\.1:[0-9]*#127.0.0.1:PORT#g' \
-        -e "s#?socket=$TEST_DIR#?socket=TEST_DIR#g" \
         -e "s#?socket=$SOCK_DIR#?socket=SOCK_DIR#g" \
         -e 's#\(foo\|PORT/\?\|.sock\): Failed to .*$#\1#'
 }