diff --git a/board/BDW01-STM32L496VG/BSP/app/mqttclient_iot_explorer.c b/board/BDW01-STM32L496VG/BSP/app/mqttclient_iot_explorer.c
index 372b308a..5bb4d30e 100644
--- a/board/BDW01-STM32L496VG/BSP/app/mqttclient_iot_explorer.c
+++ b/board/BDW01-STM32L496VG/BSP/app/mqttclient_iot_explorer.c
@@ -2,7 +2,7 @@
 #include "mcu_init.h"
 #include "tos_k.h"
 #include "mqttclient.h"
-#include "cjson.h"
+#include "cJSON.h"
 #include "sal_module_wrapper.h"
 
 
diff --git a/board/BearPi_STM32L562RE/KEIL/mqttclient_iot_explorer/demo/mqttclient_iot_explorer.c b/board/BearPi_STM32L562RE/KEIL/mqttclient_iot_explorer/demo/mqttclient_iot_explorer.c
index 80a85644..aa9dc566 100644
--- a/board/BearPi_STM32L562RE/KEIL/mqttclient_iot_explorer/demo/mqttclient_iot_explorer.c
+++ b/board/BearPi_STM32L562RE/KEIL/mqttclient_iot_explorer/demo/mqttclient_iot_explorer.c
@@ -2,7 +2,7 @@
 #include "mcu_init.h"
 #include "tos_k.h"
 #include "mqttclient.h"
-#include "cjson.h"
+#include "cJSON.h"
 #include "sal_module_wrapper.h"
 
 #define USE_ESP8266
diff --git a/board/IoTClub_EVB_L2/KEIL/mqttclient_iot_explorer/demo/mqttclient_iot_explorer.c b/board/IoTClub_EVB_L2/KEIL/mqttclient_iot_explorer/demo/mqttclient_iot_explorer.c
index ff76d0ec..a87509e7 100644
--- a/board/IoTClub_EVB_L2/KEIL/mqttclient_iot_explorer/demo/mqttclient_iot_explorer.c
+++ b/board/IoTClub_EVB_L2/KEIL/mqttclient_iot_explorer/demo/mqttclient_iot_explorer.c
@@ -2,7 +2,7 @@
 #include "mcu_init.h"
 #include "tos_k.h"
 #include "mqttclient.h"
-#include "cjson.h"
+#include "cJSON.h"
 #include "sal_module_wrapper.h"
 
 //#define USE_ESP8266
diff --git a/board/TencentOS_tiny_STM32H750/KEIL/mqtt_client_iot_exporer/demo/mqttclient_iot_explorer.c b/board/TencentOS_tiny_STM32H750/KEIL/mqtt_client_iot_exporer/demo/mqttclient_iot_explorer.c
index 30fbd63b..3b4bcc11 100644
--- a/board/TencentOS_tiny_STM32H750/KEIL/mqtt_client_iot_exporer/demo/mqttclient_iot_explorer.c
+++ b/board/TencentOS_tiny_STM32H750/KEIL/mqtt_client_iot_exporer/demo/mqttclient_iot_explorer.c
@@ -2,7 +2,7 @@
 #include "mcu_init.h"
 #include "tos_k.h"
 #include "mqttclient.h"
-#include "cjson.h"
+#include "cJSON.h"
 #include "sal_module_wrapper.h"
 
 #define USE_ESP8266
diff --git a/examples/mqttclient_iot_explorer/mqttclient_iot_explorer.c b/examples/mqttclient_iot_explorer/mqttclient_iot_explorer.c
index 4827a837..4d1c3b17 100644
--- a/examples/mqttclient_iot_explorer/mqttclient_iot_explorer.c
+++ b/examples/mqttclient_iot_explorer/mqttclient_iot_explorer.c
@@ -1,7 +1,7 @@
 #include "mcu_init.h"
 #include "tos_k.h"
 #include "mqttclient.h"
-#include "cjson.h"
+#include "cJSON.h"
 #include "sal_module_wrapper.h"
 
 #define USE_ESP8266