diff --git a/src/acp-agent.ts b/src/acp-agent.ts
index 4902f1a..c9d15fe 100644
--- a/src/acp-agent.ts
+++ b/src/acp-agent.ts
@@ -2277,7 +2277,7 @@ function createEnvForGateway(request?: GatewayAuthRequest) {
   return {
     ANTHROPIC_BASE_URL: request._meta.gateway.baseUrl,
     ANTHROPIC_CUSTOM_HEADERS: customHeaders,
-    ANTHROPIC_AUTH_TOKEN: "", // Must be specified to bypass claude login requirement
+    ANTHROPIC_AUTH_TOKEN: " ", // Must be specified to bypass claude login requirement
   };
 }
 
diff --git a/src/tests/authorization.test.ts b/src/tests/authorization.test.ts
index 6056c82..d9a36c7 100644
--- a/src/tests/authorization.test.ts
+++ b/src/tests/authorization.test.ts
@@ -117,7 +117,7 @@ describe("authorization", () => {
       expect.objectContaining({
         options: expect.objectContaining({
           env: expect.objectContaining({
-            ANTHROPIC_AUTH_TOKEN: "",
+            ANTHROPIC_AUTH_TOKEN: " ",
             ANTHROPIC_BASE_URL: "https://gateway.example",
             ANTHROPIC_CUSTOM_HEADERS: "x-api-key: test",
             userEnv: "userEnv",