diff --git a/CORE/MAC/inc/sirMacProtDef.h b/CORE/MAC/inc/sirMacProtDef.h
index abe09c8..72788e7 100644
--- a/CORE/MAC/inc/sirMacProtDef.h
+++ b/CORE/MAC/inc/sirMacProtDef.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2011-2016 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2011-2016, 2017 The Linux Foundation. All rights reserved.
  *
  * Previously licensed under the ISC license by Qualcomm Atheros, Inc.
  *
@@ -596,7 +596,7 @@
 #define SIR_MAC_MAX_NUMBER_OF_RATES          12
 #define SIR_MAC_MAX_NUM_OF_DEFAULT_KEYS      4
 #define SIR_MAC_KEY_LENGTH                   13   // WEP Maximum key length size
-#define SIR_MAC_AUTH_CHALLENGE_LENGTH        128
+#define SIR_MAC_AUTH_CHALLENGE_LENGTH        253
 #define SIR_MAC_WEP_IV_LENGTH                4
 #define SIR_MAC_WEP_ICV_LENGTH               4