diff --git a/artiq-fast/conda-build.nix b/artiq-fast/conda-build.nix
index fd4b394..3934b2d 100644
--- a/artiq-fast/conda-build.nix
+++ b/artiq-fast/conda-build.nix
@@ -6,7 +6,7 @@
 
 let
   condaBuilderEnv = import ./conda-builder-env { inherit pkgs; };
-in stdenv.mkDerivation {
+in pkgs.stdenv.mkDerivation {
   inherit name src;
   buildCommand =
     ''