diff --git a/pkgs/development/tools/pnpm/fetch-deps/default.nix b/pkgs/development/tools/pnpm/fetch-deps/default.nix
index e5032da10590..4ef68fdd50c8 100644
--- a/pkgs/development/tools/pnpm/fetch-deps/default.nix
+++ b/pkgs/development/tools/pnpm/fetch-deps/default.nix
@@ -46,6 +46,8 @@
           yq
         ];
 
+        impureEnvVars = lib.fetchers.proxyImpureEnvVars;
+
         installPhase = ''
           runHook preInstall