diff --git a/pkgs/build-support/rust/fetch-cargo-deps b/pkgs/build-support/rust/fetch-cargo-deps
index ae1ca62050f..04d33c60d30 100755
--- a/pkgs/build-support/rust/fetch-cargo-deps
+++ b/pkgs/build-support/rust/fetch-cargo-deps
@@ -1,5 +1,3 @@
-#! /bin/sh
-
 source $stdenv/setup
 
 set -euo pipefail
diff --git a/pkgs/build-support/rust/fetchcargo.nix b/pkgs/build-support/rust/fetchcargo.nix
index 5dd80bd4aa5..0ce1d0a11d3 100644
--- a/pkgs/build-support/rust/fetchcargo.nix
+++ b/pkgs/build-support/rust/fetchcargo.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation {
   phases = "unpackPhase installPhase";
 
   installPhase = ''
-    ${./fetch-cargo-deps} . "$out"
+    bash ${./fetch-cargo-deps} . "$out"
   '';
 
   outputHashAlgo = "sha256";