diff --git a/packages/safe-chain/src/packagemanager/pip/runPipCommand.spec.js b/packages/safe-chain/src/packagemanager/pip/runPipCommand.spec.js
index 7128bde..627d909 100644
--- a/packages/safe-chain/src/packagemanager/pip/runPipCommand.spec.js
+++ b/packages/safe-chain/src/packagemanager/pip/runPipCommand.spec.js
@@ -24,7 +24,7 @@ describe("runPipCommand environment variable handling", () => {
       namedExports: {
         mergeSafeChainProxyEnvironmentVariables: (env) => ({
           ...env,
-          ...(customEnv || {}),
+          ...customEnv,
           HTTPS_PROXY: "http://localhost:8080",
         }),
       },