diff --git a/.travis.yml b/.travis.yml
index 0643695b9d629e098b98b007d7f7153762fd7ff5..7e1b13f5f0d887c6b7e98639b2cf238a98921c96 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,5 @@
language: nix
+nix: 2.3.4
env:
global:
application/octet-stream
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