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-rw-r--r--pkgs/development/beam-modules/fetch-mix-deps.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/beam-modules/fetch-mix-deps.nix b/pkgs/development/beam-modules/fetch-mix-deps.nix
index 2bba3a93c2947..6d047dbe1ca59 100644
--- a/pkgs/development/beam-modules/fetch-mix-deps.nix
+++ b/pkgs/development/beam-modules/fetch-mix-deps.nix
@@ -45,7 +45,7 @@ stdenvNoCC.mkDerivation (attrs // {
 
   installPhase = attrs.installPhase or ''
     runHook preInstall
-    mix deps.get ''${mixEnv:+--only $mixEnv}
+    mix deps.get ''${MIX_ENV:+--only $MIX_ENV}
     find "$TEMPDIR/deps" -path '*/.git/*' -a ! -name HEAD -exec rm -rf {} +
     cp -r --no-preserve=mode,ownership,timestamps $TEMPDIR/deps $out
     runHook postInstall