diff --git a/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/process.py b/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/process.py
index 9f6baaa178a9..567cb87c429c 100644
--- a/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/process.py
+++ b/pkgs/by-name/ni/nixos-rebuild-ng/src/nixos_rebuild/process.py
@@ -19,7 +19,7 @@ SSH_DEFAULT_OPTS: Final = [
     "-o",
     "ControlMaster=auto",
     "-o",
-    f"ControlPath={tmpdir.TMPDIR_PATH / 'ssh-%n'}",
+    f"ControlPath={tmpdir.TMPDIR_PATH / 'ssh-%C'}",
     "-o",
     "ControlPersist=60",
 ]