diff --git a/pkgs/by-name/ni/nix-prefetch/fix-extendMkDerivation-overlay.patch b/pkgs/by-name/ni/nix-prefetch/fix-extendMkDerivation-overlay.patch
new file mode 100644
index 0000000000000..d578b4d354adb
--- /dev/null
+++ b/pkgs/by-name/ni/nix-prefetch/fix-extendMkDerivation-overlay.patch
@@ -0,0 +1,23 @@
+--- a/lib/overlay.nix	2025-12-12 14:17:10.585262065 -0500
++++ b/lib/overlay.nix	2025-12-12 14:17:31.567341843 -0500
+@@ -35,9 +35,17 @@
+     ];
+   };
+ 
+-  curlFetcher = fetcher: setFunctionArgs (args: fetcher (args // {
+-    curlOpts = (args.curlOpts or "") + " --no-insecure --cacert ${cacert}/etc/ssl/certs/ca-bundle.crt ";
+-  })) (functionArgs fetcher);
++  # Handle both attrset and function arguments for extendMkDerivation compatibility
++  curlFetcher = fetcher: setFunctionArgs (args:
++    let
++      modifyArgs = a: a // {
++        curlOpts = (a.curlOpts or "") + " --no-insecure --cacert ${cacert}/etc/ssl/certs/ca-bundle.crt ";
++      };
++    in
++      if isFunction args
++      then fetcher (final: modifyArgs (args final))
++      else fetcher (modifyArgs args)
++  ) (functionArgs fetcher);
+ 
+   unsafeFetcher = name: reason: throw "The fetcher ${name} is deemed unsafe: ${reason}.";
+ 
diff --git a/pkgs/by-name/ni/nix-prefetch/fix-extendMkDerivation-prelude.patch b/pkgs/by-name/ni/nix-prefetch/fix-extendMkDerivation-prelude.patch
new file mode 100644
index 0000000000000..34474335e1368
--- /dev/null
+++ b/pkgs/by-name/ni/nix-prefetch/fix-extendMkDerivation-prelude.patch
@@ -0,0 +1,37 @@
+--- a/lib/prelude.nix
++++ b/lib/prelude.nix
+@@ -108,9 +108,24 @@
+ 
+   primitiveFetchers = listFetchers builtinsOverlay true ++ [ "fetchurlBoot" ];
+ 
++  # Helper to merge args, handling both attrsets and functions (for extendMkDerivation)
++  mergeArgsWithRequired = requiredArgs: args:
++    if isFunction args
++    then final: requiredArgs // args final
++    else requiredArgs // args;
++
++  # Helper to safely intersect args with oldArgs, handling function args
++  safeIntersectArgs = args: oldArgs:
++    if isFunction args
++    then {}  # When args is a function, we can't know the keys at evaluation time
++    else builtins.intersectAttrs args oldArgs;
++
+   markFetcher = { type, name, fetcher }:
+     let
+-      customFetcher = args: markFetcherDrv { inherit type name fetcher args; drv = fetcher (requiredFetcherArgs // args); };
++      customFetcher = args: markFetcherDrv {
++        inherit type name fetcher args;
++        drv = fetcher (mergeArgsWithRequired requiredFetcherArgs args);
++      };
+ 
+       # The required fetcher arguments are assumed to be of type string,
+       # because requiring a complex value, e.g. a derivation attrset, is very unlikely,
+@@ -132,7 +147,7 @@
+               if !(elem origPassthru.__fetcher.name primitiveFetchers) then functionArgs origPassthru.__fetcher
+               else throw "Fetcher ${name} is build on top of the primitive fetcher ${origPassthru.__fetcher.name}, which is not supported."
+             else {};
+-          newArgs = oldArgs // functionArgs fetcher // mapAttrs (_: _: true) (builtins.intersectAttrs args oldArgs);
++          newArgs = oldArgs // functionArgs fetcher // mapAttrs (_: _: true) (safeIntersectArgs args oldArgs);
+         in {
+           passthru = origPassthru // {
+             __fetcher = setFunctionArgs fetcher newArgs // { inherit type name args; drv = drvOverriden; };
diff --git a/pkgs/by-name/ni/nix-prefetch/package.nix b/pkgs/by-name/ni/nix-prefetch/package.nix
index 4a58d1905095c..a1ee9754a6610 100644
--- a/pkgs/by-name/ni/nix-prefetch/package.nix
+++ b/pkgs/by-name/ni/nix-prefetch/package.nix
@@ -47,6 +47,11 @@ stdenv.mkDerivation (finalAttrs: {
       url = "https://github.com/msteen/nix-prefetch/commit/508237f48f7e2d8496ce54f38abbe57f44d0cbca.patch";
       hash = "sha256-9SYPcRFZaVyNjMUVdXbef5eGvLp/kr379eU9lG5GgE0=";
     })
+    # Fix compatibility with extendMkDerivation-based fetchers (fetchzip, fetchgit, etc.)
+    # The curlFetcher and markFetcher functions assumed fetcher arguments are always
+    # attribute sets, but extendMkDerivation can pass functions for the finalAttrs pattern.
+    ./fix-extendMkDerivation-overlay.patch
+    ./fix-extendMkDerivation-prelude.patch
   ];
 
   postPatch = ''