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-rw-r--r--nixpkgs/nixos/lib/test-driver/test_driver/driver.py1
1 files changed, 1 insertions, 0 deletions
diff --git a/nixpkgs/nixos/lib/test-driver/test_driver/driver.py b/nixpkgs/nixos/lib/test-driver/test_driver/driver.py
index 880b1c5fdec0..0e5f013193fe 100644
--- a/nixpkgs/nixos/lib/test-driver/test_driver/driver.py
+++ b/nixpkgs/nixos/lib/test-driver/test_driver/driver.py
@@ -55,6 +55,7 @@ class Driver:
         tmp_dir = get_tmp_dir()
 
         with rootlog.nested("start all VLans"):
+            vlans = list(set(vlans))
             self.vlans = [VLan(nr, tmp_dir) for nr in vlans]
 
         def cmd(scripts: List[str]) -> Iterator[NixStartScript]: