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-rw-r--r--corepkgs/fetchurl.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/corepkgs/fetchurl.nix b/corepkgs/fetchurl.nix
index 72107294c7..3d467fe187 100644
--- a/corepkgs/fetchurl.nix
+++ b/corepkgs/fetchurl.nix
@@ -3,7 +3,7 @@ with import <nix/config.nix>;
 # Argh, this thing is duplicated (more-or-less) in Nixpkgs.  Need to
 # find a way to combine them.
 
-{system, url, outputHash ? "", outputHashAlgo ? "", md5 ? "", sha1 ? "", sha256 ? ""}:
+{system ? builtins.currentSystem, url, outputHash ? "", outputHashAlgo ? "", md5 ? "", sha1 ? "", sha256 ? ""}:
 
 assert (outputHash != "" && outputHashAlgo != "")
     || md5 != "" || sha1 != "" || sha256 != "";