diff --git a/components/bt/bluedroid/bta/dm/bta_dm_api.c b/components/bt/bluedroid/bta/dm/bta_dm_api.c
index 0ae3af50a1..4e3953f233 100644
--- a/components/bt/bluedroid/bta/dm/bta_dm_api.c
+++ b/components/bt/bluedroid/bta/dm/bta_dm_api.c
@@ -2127,7 +2127,7 @@ void BTA_DmCloseACL(BD_ADDR bd_addr, BOOLEAN remove_dev, tBTA_TRANSPORT transpor
 ** Returns          void.
 **
 *******************************************************************************/
-extern void BTA_DmBleObserve(BOOLEAN start, UINT8 duration,
+extern void BTA_DmBleObserve(BOOLEAN start, UINT32 duration,
                              tBTA_DM_SEARCH_CBACK *p_results_cb,
                              tBTA_START_STOP_SCAN_CMPL_CBACK *p_start_stop_scan_cb)
 {
diff --git a/components/bt/bluedroid/bta/dm/bta_dm_int.h b/components/bt/bluedroid/bta/dm/bta_dm_int.h
index adb5fc033d..91a0cb056e 100644
--- a/components/bt/bluedroid/bta/dm/bta_dm_int.h
+++ b/components/bt/bluedroid/bta/dm/bta_dm_int.h
@@ -478,7 +478,7 @@ typedef struct {
 typedef struct {
     BT_HDR                  hdr;
     BOOLEAN                 start;
-    UINT16                  duration;
+    UINT32                  duration;
     tBTA_DM_SEARCH_CBACK    *p_cback;
     tBTA_START_STOP_SCAN_CMPL_CBACK *p_start_scan_cback;
     tBTA_START_STOP_SCAN_CMPL_CBACK *p_stop_scan_cback;
diff --git a/components/bt/bluedroid/bta/include/bta_api.h b/components/bt/bluedroid/bta/include/bta_api.h
index 0c6baa92d5..6d9842d14c 100644
--- a/components/bt/bluedroid/bta/include/bta_api.h
+++ b/components/bt/bluedroid/bta/include/bta_api.h
@@ -2010,7 +2010,7 @@ extern void BTA_DmSetEncryption(BD_ADDR bd_addr, tBTA_TRANSPORT transport,
 ** Returns          void
 **
 *******************************************************************************/
-extern void BTA_DmBleObserve(BOOLEAN start, UINT8 duration,
+extern void BTA_DmBleObserve(BOOLEAN start, UINT32 duration,
                              tBTA_DM_SEARCH_CBACK *p_results_cb,
                              tBTA_START_STOP_SCAN_CMPL_CBACK *p_start_stop_scan_cb);
 
diff --git a/components/bt/bluedroid/btc/profile/std/gap/btc_gap_ble.c b/components/bt/bluedroid/btc/profile/std/gap/btc_gap_ble.c
index 027e8d4acd..a55ec4d743 100644
--- a/components/bt/bluedroid/btc/profile/std/gap/btc_gap_ble.c
+++ b/components/bt/bluedroid/btc/profile/std/gap/btc_gap_ble.c
@@ -580,7 +580,7 @@ static void btc_set_encryption_callback(BD_ADDR bd_addr, tBTA_TRANSPORT transpor
 }
 #endif  ///SMP_INCLUDED == TRUE
 
-static void btc_ble_start_scanning(uint8_t duration,
+static void btc_ble_start_scanning(uint32_t duration,
                                    tBTA_DM_SEARCH_CBACK *results_cb,
                                    tBTA_START_STOP_SCAN_CMPL_CBACK *start_scan_cb)
 {
diff --git a/components/bt/bluedroid/stack/btm/btm_ble_gap.c b/components/bt/bluedroid/stack/btm/btm_ble_gap.c
index 9bf52ac221..0c1dc29a93 100644
--- a/components/bt/bluedroid/stack/btm/btm_ble_gap.c
+++ b/components/bt/bluedroid/stack/btm/btm_ble_gap.c
@@ -341,7 +341,7 @@ BOOLEAN btm_ble_send_extended_scan_params(UINT8 scan_type, UINT32 scan_int,
 ** Returns          void
 **
 *******************************************************************************/
-tBTM_STATUS BTM_BleObserve(BOOLEAN start, UINT8 duration,
+tBTM_STATUS BTM_BleObserve(BOOLEAN start, UINT32 duration,
                            tBTM_INQ_RESULTS_CB *p_results_cb, tBTM_CMPL_CB *p_cmpl_cb)
 {
     tBTM_BLE_INQ_CB *p_inq = &btm_cb.ble_ctr_cb.inq_var;
diff --git a/components/bt/bluedroid/stack/include/btm_ble_api.h b/components/bt/bluedroid/stack/include/btm_ble_api.h
index 1b78276cb3..f34db43d24 100644
--- a/components/bt/bluedroid/stack/include/btm_ble_api.h
+++ b/components/bt/bluedroid/stack/include/btm_ble_api.h
@@ -1191,7 +1191,7 @@ tBTM_STATUS BTM_BleWriteScanRspRaw(UINT8 *p_raw_scan_rsp, UINT32 raw_scan_rsp_le
 **
 *******************************************************************************/
 //extern
-tBTM_STATUS BTM_BleObserve(BOOLEAN start, UINT8 duration,
+tBTM_STATUS BTM_BleObserve(BOOLEAN start, UINT32 duration,
                            tBTM_INQ_RESULTS_CB *p_results_cb, tBTM_CMPL_CB *p_cmpl_cb);