diff --git a/src/agents/sandbox/sanitize-env-vars.ts b/src/agents/sandbox/sanitize-env-vars.ts
index 3dd84a87f1aa..b91b4e3710a8 100644
--- a/src/agents/sandbox/sanitize-env-vars.ts
+++ b/src/agents/sandbox/sanitize-env-vars.ts
@@ -47,7 +47,7 @@ type EnvVarSanitizationResult = {
   warnings: string[];
 };
 
-export type EnvSanitizationOptions = {
+type EnvSanitizationOptions = {
   strictMode?: boolean;
   customBlockedPatterns?: ReadonlyArray<RegExp>;
   customAllowedPatterns?: ReadonlyArray<RegExp>;