diff --git a/docker/images/n8n/n8n-task-runners.json b/docker/images/n8n/n8n-task-runners.json
index 5bd9c54a1f..e88d2f1184 100644
--- a/docker/images/n8n/n8n-task-runners.json
+++ b/docker/images/n8n/n8n-task-runners.json
@@ -22,6 +22,7 @@
 				"N8N_RUNNERS_HEALTH_CHECK_SERVER_PORT",
 				"NODE_FUNCTION_ALLOW_BUILTIN",
 				"NODE_FUNCTION_ALLOW_EXTERNAL",
+				"N8N_RUNNERS_ALLOW_PROTOTYPE_MUTATION",
 				"NODE_OPTIONS",
 				"NODE_PATH",
 				"N8N_SENTRY_DSN",
diff --git a/packages/cli/src/task-runners/__tests__/task-runner-process.test.ts b/packages/cli/src/task-runners/__tests__/task-runner-process.test.ts
index 6c76c25390..b774315c1d 100644
--- a/packages/cli/src/task-runners/__tests__/task-runner-process.test.ts
+++ b/packages/cli/src/task-runners/__tests__/task-runner-process.test.ts
@@ -78,6 +78,7 @@ describe('TaskRunnerProcess', () => {
 			'DEPLOYMENT_NAME',
 			'NODE_PATH',
 			'GENERIC_TIMEZONE',
+			'N8N_RUNNERS_ALLOW_PROTOTYPE_MUTATION',
 		])('should propagate %s from env as is', async (envVar) => {
 			jest.spyOn(authService, 'createGrantToken').mockResolvedValue('grantToken');
 			process.env[envVar] = 'custom value';
diff --git a/packages/cli/src/task-runners/task-runner-process.ts b/packages/cli/src/task-runners/task-runner-process.ts
index e78d8e7a83..b625056e41 100644
--- a/packages/cli/src/task-runners/task-runner-process.ts
+++ b/packages/cli/src/task-runners/task-runner-process.ts
@@ -59,6 +59,7 @@ export class TaskRunnerProcess extends TypedEmitter<TaskRunnerProcessEventMap> {
 		'NODE_FUNCTION_ALLOW_BUILTIN',
 		'NODE_FUNCTION_ALLOW_EXTERNAL',
 		'N8N_SENTRY_DSN',
+		'N8N_RUNNERS_ALLOW_PROTOTYPE_MUTATION',
 		// Metadata about the environment
 		'N8N_VERSION',
 		'ENVIRONMENT',