diff --git a/packages/safe-chain/src/packagemanager/rush/runRushCommand.js b/packages/safe-chain/src/packagemanager/rush/runRushCommand.js
index f2b249f..340e3f6 100644
--- a/packages/safe-chain/src/packagemanager/rush/runRushCommand.js
+++ b/packages/safe-chain/src/packagemanager/rush/runRushCommand.js
@@ -9,13 +9,9 @@ import { reportCommandExecutionFailure } from "../_shared/commandErrors.js";
  */
 export async function runRushCommand(executableName, args) {
   try {
-    const env = prepareRushEnvironmentVariables(
-      mergeSafeChainProxyEnvironmentVariables(process.env),
-    );
-
     const result = await safeSpawn(executableName, args, {
       stdio: "inherit",
-      env,
+      env: mergeSafeChainProxyEnvironmentVariables(process.env),
     });
 
     return { status: result.status };
@@ -23,19 +19,3 @@ export async function runRushCommand(executableName, args) {
     return reportCommandExecutionFailure(error, executableName);
   }
 }
-
-/**
- * @param {Record<string, string>} env
- * @returns {Record<string, string>}
- */
-function prepareRushEnvironmentVariables(env) {
-  const prepared = {
-    ...env,
-  };
-
-  if (prepared.HTTPS_PROXY && !prepared.HTTP_PROXY) {
-    prepared.HTTP_PROXY = prepared.HTTPS_PROXY;
-  }
-
-  return prepared;
-}
diff --git a/packages/safe-chain/src/packagemanager/rush/runRushCommand.spec.js b/packages/safe-chain/src/packagemanager/rush/runRushCommand.spec.js
index 343fb1e..fa2c35a 100644
--- a/packages/safe-chain/src/packagemanager/rush/runRushCommand.spec.js
+++ b/packages/safe-chain/src/packagemanager/rush/runRushCommand.spec.js
@@ -74,7 +74,6 @@ describe("runRushCommand", () => {
     assert.deepStrictEqual(args, ["install"]);
     assert.strictEqual(options.stdio, "inherit");
     assert.strictEqual(options.env.HTTPS_PROXY, "http://localhost:8080");
-    assert.strictEqual(options.env.HTTP_PROXY, "http://localhost:8080");
     assert.ok(mergeCalls.length >= 1, "proxy env merge should be called");
   });