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-rw-r--r--pkgs/build-support/fetchurl/default.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/pkgs/build-support/fetchurl/default.nix b/pkgs/build-support/fetchurl/default.nix
index 00f485ce6975..2cc45ca4bbf2 100644
--- a/pkgs/build-support/fetchurl/default.nix
+++ b/pkgs/build-support/fetchurl/default.nix
@@ -112,7 +112,8 @@ if (!hasHash) then throw "Specify hash for fetchurl fixed-output derivation: ${s
   outputHashAlgo = if outputHashAlgo != "" then outputHashAlgo else
       if sha512 != "" then "sha512" else if sha256 != "" then "sha256" else if sha1 != "" then "sha1" else "md5";
   outputHash = if outputHash != "" then outputHash else
-      if sha512 != "" then sha512 else if sha256 != "" then sha256 else if sha1 != "" then sha1 else md5;
+      if sha512 != "" then sha512 else if sha256 != "" then sha256 else if sha1 != "" then sha1 else
+        (stdenv.lib.fetchMD5warn "fetchurl" (builtins.head urls_) md5);
 
   outputHashMode = if (recursiveHash || executable) then "recursive" else "flat";