diff --git a/.travis.yml b/.travis.yml
index 6485802..575a93e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,9 +23,9 @@ env:
 
 matrix:
   include:
-    - env: NIX_PATH: nixpkgs=channel:nixpkgs-unstable
-    - env: NIX_PATH: nixpkgs=channel:nixos-unstable
-    - env: NIX_PATH: nixpkgs=channel:nixos-20.03
+    - env: NIX_PATH=nixpkgs=channel:nixpkgs-unstable
+    - env: NIX_PATH=nixpkgs=channel:nixos-unstable
+    - env: NIX_PATH=nixpkgs=channel:nixos-20.03
 
 script:
  - nix-build ci.nix -A buildOutputs