diff --git a/pkgs/build-support/build-bazel-package/default.nix b/pkgs/build-support/build-bazel-package/default.nix
index 74486e2e1003..f379334786b6 100644
--- a/pkgs/build-support/build-bazel-package/default.nix
+++ b/pkgs/build-support/build-bazel-package/default.nix
@@ -58,7 +58,7 @@ in stdenv.mkDerivation (fBuildAttrs // {
     name = "${name}-deps.tar.gz";
     inherit bazelFlags bazelBuildFlags bazelFetchFlags bazelTarget;
 
-    impureEnvVars = lib.fetchers.proxyImpureEnvVars;
+    impureEnvVars = lib.fetchers.proxyImpureEnvVars ++ fFetchAttrs.impureEnvVars or [];
 
     nativeBuildInputs = fFetchAttrs.nativeBuildInputs or [] ++ [ bazel ];