diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index d534e94..411f135 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -114,7 +114,8 @@ _make_test_img()
             -e "s# compat='[^']*'##g" \
             -e "s# compat6=\\(on\\|off\\)##g" \
             -e "s# static=\\(on\\|off\\)##g" \
-            -e "s# lazy_refcounts=\\(on\\|off\\)##g"
+            -e "s# lazy_refcounts=\\(on\\|off\\)##g" \
+            -e "s# dedup=\\(on\\|off\\)##g"
 }
 
 _cleanup_test_img()