diff --git a/.travis.yml b/.travis.yml
index 5a2a750da7108d1f825105610ae11212d9003aa9..8bd74bc390de08238a29cb2c5b11d510df24af44 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,7 +14,7 @@  - if [ -n "${CACHIX_CACHE}" ]; then nix-env -if https://github.com/cachix/cachix/tarball/master --substituters https://cachix.cachix.org --trusted-public-keys cachix.cachix.org-1:eWNHQldwUO7G2VkjpnjDbWwy4KQ/HNxht7H4SSoMckM=; fi
  - if [ -n "${CACHIX_CACHE}" ]; then cachix use "${CACHIX_CACHE}"; fi
 
 script:
- - outs=$(nix-build non-broken.nix)
+ - export outs=$(nix-build non-broken.nix)
  - echo Produced $outs
 
 after_success: