diff --git a/pkgs/build-support/fetchbzr/default.nix b/pkgs/build-support/fetchbzr/default.nix
index b7db9e9274da..1f6f0f2a788e 100644
--- a/pkgs/build-support/fetchbzr/default.nix
+++ b/pkgs/build-support/fetchbzr/default.nix
@@ -1,15 +1,16 @@
-{ stdenvNoCC, breezy }:
-{ url, rev, sha256 }:
+{ lib, stdenvNoCC, breezy }:
+lib.fetchers.withNormalizedHash { } (
+  { url, rev, outputHash, outputHashAlgo }:
 
-stdenvNoCC.mkDerivation {
-  name = "bzr-export";
+  stdenvNoCC.mkDerivation {
+    name = "bzr-export";
 
-  builder = ./builder.sh;
-  nativeBuildInputs = [ breezy ];
+    builder = ./builder.sh;
+    nativeBuildInputs = [ breezy ];
 
-  outputHashAlgo = "sha256";
-  outputHashMode = "recursive";
-  outputHash = sha256;
+    inherit outputHash outputHashAlgo;
+    outputHashMode = "recursive";
 
-  inherit url rev;
-}
+    inherit url rev;
+  }
+)