diff --git a/fetcher.nix b/fetcher.nix
index 11228bd..2fb3ccc 100644
--- a/fetcher.nix
+++ b/fetcher.nix
@@ -31,6 +31,7 @@ lib.makeOverridable (
     fetchLFS ? false,
     sparseCheckout ? [ ],
 
+    passthru ? { },
     meta ? { },
     ...
   }@args:
@@ -103,6 +104,7 @@ lib.makeOverridable (
               leaveDotGit
               ;
             url = baseUrl;
+            inherit passthru;
           }
         else
           {
@@ -111,7 +113,8 @@ lib.makeOverridable (
 
             passthru = {
               gitRepoUrl = baseUrl;
-            };
+            }
+            // passthru;
           }
       )
       // {