diff --git a/pkgs/build-support/rust/build-rust-package/default.nix b/pkgs/build-support/rust/build-rust-package/default.nix
index 8fda358ee0120..f5634cb80c14c 100644
--- a/pkgs/build-support/rust/build-rust-package/default.nix
+++ b/pkgs/build-support/rust/build-rust-package/default.nix
@@ -71,7 +71,7 @@ let
     if cargoVendorDir != null then null
     else if cargoDeps != null then cargoDeps
     else if cargoLock != null then importCargoLock cargoLock
-    else if useFetchCargoVendor then (fetchCargoVendor {
+    else if useFetchCargoVendor then fetchCargoVendor ({
       inherit src srcs sourceRoot preUnpack unpackPhase postUnpack;
       name = cargoDepsName;
       patches = cargoPatches;