diff --git a/pkgs/build-support/fetchurl/default.nix b/pkgs/build-support/fetchurl/default.nix
index e4a70743334b5..88b3eb1721416 100644
--- a/pkgs/build-support/fetchurl/default.nix
+++ b/pkgs/build-support/fetchurl/default.nix
@@ -215,7 +215,7 @@ stdenvNoCC.mkDerivation (
 
     # If set, prefer the content-addressable mirrors
     # (http://tarballs.nixos.org) over the original URLs.
-    preferHashedMirrors = true;
+    preferHashedMirrors = false;
 
     # New-style output content requirements.
     inherit (hash_) outputHashAlgo outputHash;