diff --git a/pkgs/build-support/fetchurl/default.nix b/pkgs/build-support/fetchurl/default.nix
index cb2c5c8cffc3..752136df450e 100644
--- a/pkgs/build-support/fetchurl/default.nix
+++ b/pkgs/build-support/fetchurl/default.nix
@@ -278,8 +278,6 @@ lib.extendMkDerivation {
 
       finalHashHasColon = match ".*:.*" finalAttrs.hash != null;
       finalHashColonMatch = match "([^:]+)[:](.*)" finalAttrs.hash;
-
-      resolvedUrl = head (resolveUrl url);
     in
 
     derivationArgs
@@ -382,7 +380,8 @@ lib.extendMkDerivation {
 
       inherit meta;
       passthru = {
-        inherit url resolvedUrl;
+        inherit url;
+        resolvedUrl = head (resolveUrl url);
       }
       // passthru;
     };