diff --git a/oauth2_http/javatests/com/google/auth/oauth2/MockMetadataServerTransport.java b/oauth2_http/javatests/com/google/auth/oauth2/MockMetadataServerTransport.java
index f8eaf8b84..9777f262b 100644
--- a/oauth2_http/javatests/com/google/auth/oauth2/MockMetadataServerTransport.java
+++ b/oauth2_http/javatests/com/google/auth/oauth2/MockMetadataServerTransport.java
@@ -316,7 +316,7 @@ public LowLevelHttpResponse execute() throws IOException {
         // Create the JSON response
         GenericJson content = new GenericJson();
         content.setFactory(OAuth2Utils.JSON_FACTORY);
-        if (requestStatusCode < 400) {
+        if (requestStatusCode == 200) {
           content.put(plaintextS2AAddressJsonKey, plaintextS2AAddress);
           content.put(mtlsS2AAddressJsonKey, mtlsS2AAddress);
         }