3 files changed, 5 insertions, 5 deletions
diff --git a/class/cdc/usbh_cdc_acm.c b/class/cdc/usbh_cdc_acm.c
index ba4790fa..27d51584 100644
--- a/class/cdc/usbh_cdc_acm.c
+++ b/class/cdc/usbh_cdc_acm.c
@@ -27,7 +27,7 @@
 
 static uint32_t g_devinuse = 0;
 
-void usbh_cdc_acm_callback(void *arg, ssize_t nbytes);
+void usbh_cdc_acm_callback(void *arg, int nbytes);
 
 /****************************************************************************
  * Name: usbh_cdc_acm_devno_alloc
@@ -316,7 +316,7 @@ int usbh_cdc_acm_disconnect(struct usbh_hubport *hport, uint8_t intf)
     return ret;
 }
 
-void usb_cdc_acm_callback(void *arg, ssize_t result)
+void usb_cdc_acm_callback(void *arg, int result)
 {
     printf("result:%d\r\n", result);
 }
diff --git a/class/hid/usbh_hid.c b/class/hid/usbh_hid.c
index c149216f..b7aff16f 100644
--- a/class/hid/usbh_hid.c
+++ b/class/hid/usbh_hid.c
@@ -161,7 +161,7 @@ int usbh_hid_get_idle(struct usbh_hubport *hport, uint8_t intf, uint8_t *buffer)
 
 USB_NOCACHE_RAM_SECTION uint8_t report_buffer[128];
 
-void usbh_hid_callback(void *arg, ssize_t nbytes)
+void usbh_hid_callback(void *arg, int nbytes)
 {
     printf("nbytes:%d\r\n", nbytes);
 }
diff --git a/class/hub/usbh_hub.c b/class/hub/usbh_hub.c
index 992b6aef..9db9c0b2 100644
--- a/class/hub/usbh_hub.c
+++ b/class/hub/usbh_hub.c
@@ -35,7 +35,7 @@ extern void usbh_external_hport_disconnect(struct usbh_hubport *hport);
 extern void usbh_hport_activate(struct usbh_hubport *hport);
 extern void usbh_hport_deactivate(struct usbh_hubport *hport);
 
-static void usbh_external_hub_callback(void *arg, ssize_t nbytes);
+static void usbh_external_hub_callback(void *arg, int nbytes);
 
 static inline void usbh_hub_register(struct usbh_hub *hub)
 {
@@ -468,7 +468,7 @@ static void usbh_extern_hub_psc_event(void *arg)
     usb_osal_leave_critical_section(flags);
 }
 
-static void usbh_external_hub_callback(void *arg, ssize_t nbytes)
+static void usbh_external_hub_callback(void *arg, int nbytes)
 {
     struct usbh_hub *hub_class = (struct usbh_hub *)arg;
     uint32_t delay = 0;