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diff --git a/.travis.yml b/.travis.yml
index d04a7c1e580a6b5ea10ef2e3b4fc212609cc5198..91e4b5bec25ddcfbde4f75276616b8d44581fb32 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,10 +11,7 @@ matrix:
   include:
     - env: NIX_CHANNEL=https://nixos.org/channels/nixpkgs-unstable
     - env: NIX_CHANNEL=https://nixos.org/channels/nixos-unstable
-    - env: NIX_CHANNEL=https://nixos.org/channels/nixos-18.03
-  # cachix will be introduced in 18.09, so we just allow a failure for now
-  allow_failures:
-    - env: NIX_CHANNEL=https://nixos.org/channels/nixos-18.03
+    - env: NIX_CHANNEL=https://nixos.org/channels/nixos-18.09
 
 install:
  - nix --version