diff --git a/pyanaconda/modules/payloads/payload/rpm_ostree/installation.py b/pyanaconda/modules/payloads/payload/rpm_ostree/installation.py
index 083f1187db9..6f1e77e50d0 100644
--- a/pyanaconda/modules/payloads/payload/rpm_ostree/installation.py
+++ b/pyanaconda/modules/payloads/payload/rpm_ostree/installation.py
@@ -572,7 +572,7 @@ def _set_kargs(self):
             device_tree.GetDeviceData(root_id)
         )
 
-        set_kargs_args = ["admin", "instutil", "set-kargs"]
+        set_kargs_args = ["admin", "instutil", "set-kargs", "--merge"]
         set_kargs_args.extend(bootloader.GetArguments())
         set_kargs_args.append("root=" + device_tree.GetFstabSpec(root_id))
         set_kargs_args.append("vconsole.keymap=" + localization.VirtualConsoleKeymap)