1 files changed, 5 insertions, 1 deletions
diff --git a/default.nix b/default.nix
index 0e25b05..516691e 100644
--- a/default.nix
+++ b/default.nix
@@ -1,6 +1,10 @@
 { nixpkgs ? null, compiler ? "ghc865", doBenchmark ? false } :
 let
-  pinnedPkg = <nixpkgs>;
+  pinnedPkg = builtins.fetchGit {
+    name = "nixos-unstable-2020-03-06";
+    url = https://github.com/nixos/nixpkgs/;
+    rev = "93ba4ecd58602d3f69f74f9d45d60a8f949544e2";
+  };
   npkgs = if nixpkgs == null
           then import pinnedPkg {}
           else import nixpkgs {};