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-rw-r--r--pkgs/build-support/fetchhg/default.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/pkgs/build-support/fetchhg/default.nix b/pkgs/build-support/fetchhg/default.nix
index 79f610166a7..b30a3556b0f 100644
--- a/pkgs/build-support/fetchhg/default.nix
+++ b/pkgs/build-support/fetchhg/default.nix
@@ -15,7 +15,8 @@ stdenv.mkDerivation {
 
   outputHashAlgo = if md5 != null then "md5" else "sha256";
   outputHashMode = "recursive";
-  outputHash = if md5 != null then md5 else sha256;
+  outputHash = if md5 != null then
+    (stdenv.lib.fetchMD5warn "fetchhg" url md5) else sha256;
 
   inherit url rev;
   preferLocalBuild = true;