diff --git a/lib/logger.js b/lib/logger.js
index 6cc9b4d..d07e49b 100644
--- a/lib/logger.js
+++ b/lib/logger.js
@@ -172,8 +172,8 @@ function flatten(details) {
     }
     else if (details.rpc.cpeFault) {
       details.acsRequestId = details.rpc.id;
-      details.cpeFaultCode = details.rpc.cpeFault.faultCode;
-      details.cpeFaultString = details.rpc.cpeFault.faultString;
+      details.cpeFaultCode = details.rpc.cpeFault.detail.faultCode;
+      details.cpeFaultString = details.rpc.cpeFault.detail.faultString;
     }
     delete details.rpc;
   }