diff --git a/core/hdd/src/wlan_hdd_cfg.c b/core/hdd/src/wlan_hdd_cfg.c
index 8554622b28a9..9fbba15d06d8 100644
--- a/core/hdd/src/wlan_hdd_cfg.c
+++ b/core/hdd/src/wlan_hdd_cfg.c
@@ -5828,7 +5828,7 @@ QDF_STATUS hdd_update_mac_config(hdd_context_t *pHddCtx)
 	}
 	buffer = temp;
 	qdf_mem_copy(buffer, fw->data, fw->size);
-	buffer[fw->size + 1] = 0x0;
+	buffer[fw->size] = 0x0;
 
 	/* data format:
 	 * Intf0MacAddress=00AA00BB00CC