diff --git a/core/mac/inc/sir_mac_prot_def.h b/core/mac/inc/sir_mac_prot_def.h
index 5106bc8bf6ff..1f8582abcde8 100644
--- a/core/mac/inc/sir_mac_prot_def.h
+++ b/core/mac/inc/sir_mac_prot_def.h
@@ -168,7 +168,7 @@
 #define SIR_MAC_BA_POLICY_DELAYED	0
 #define SIR_MAC_BA_POLICY_IMMEDIATE	1
 #define SIR_MAC_BA_AMSDU_SUPPORTED	1
-#define SIR_MAC_BA_DEFAULT_BUFF_SIZE	64
+#define SIR_MAC_BA_DEFAULT_BUFF_SIZE	63
 
 #ifdef ANI_SUPPORT_11H
 #define SIR_MAC_ACTION_MEASURE_REQUEST_ID      0