diff --git a/release.nix b/release.nix
index 7db5e20e1..0dac174ac 100644
--- a/release.nix
+++ b/release.nix
@@ -1,5 +1,5 @@
 { nix ? builtins.fetchGit ./.
-, nixpkgs ? builtins.fetchGit { url = https://github.com/NixOS/nixpkgs.git; ref = "release-18.03"; }
+, nixpkgs ? builtins.fetchGit { url = https://github.com/NixOS/nixpkgs-channels.git; ref = "nixos-18.03"; }
 , officialRelease ? false
 , systems ? [ "x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" ]
 }:
@@ -55,7 +55,9 @@ let
 
     build = pkgs.lib.genAttrs systems (system:
 
-      with import nixpkgs { inherit system; };
+      let pkgs = import nixpkgs { inherit system; }; in
+
+      with pkgs;
 
       with import ./release-common.nix { inherit pkgs; };
 
diff --git a/shell.nix b/shell.nix
index 20cf4133b..c04bcd151 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,6 +1,6 @@
 { useClang ? false }:
 
-with import (builtins.fetchGit { url = https://github.com/NixOS/nixpkgs.git; ref = "release-18.03"; }) {};
+with import (builtins.fetchGit { url = https://github.com/NixOS/nixpkgs-channels.git; ref = "nixos-18.03"; }) {};
 
 with import ./release-common.nix { inherit pkgs; };