1 files changed, 7 insertions, 5 deletions
diff --git a/nixpkgs/pkgs/development/compilers/nim/default.nix b/nixpkgs/pkgs/development/compilers/nim/default.nix
index 7434347f2a28..16896c8b6c05 100644
--- a/nixpkgs/pkgs/development/compilers/nim/default.nix
+++ b/nixpkgs/pkgs/development/compilers/nim/default.nix
@@ -72,15 +72,17 @@ let
   nimHost = parsePlatform stdenv.hostPlatform;
   nimTarget = parsePlatform stdenv.targetPlatform;
 
-  bootstrapCompiler = stdenv.mkDerivation rec {
+  bootstrapCompiler = let
+    revision = "561b417c65791cd8356b5f73620914ceff845d10";
+  in stdenv.mkDerivation {
     pname = "nim-bootstrap";
-    version = "0.20.0";
+    version = "g${lib.substring 0 7 revision}";
 
     src = fetchgit {
       # A Git checkout is much smaller than a GitHub tarball.
-      url = "https://github.com/nim-lang/csources.git";
-      rev = "v${version}";
-      sha256 = "0i6vsfy1sgapx43n226q8m0pvn159sw2mhp50zm3hhb9zfijanis";
+      url = "https://github.com/nim-lang/csources_v1.git";
+      rev = revision;
+      sha256 = "1c2k681knrha1zmf4abhb32i2wwd3nwflzylnqryxk753swla043";
     };
 
     enableParallelBuilding = true;