diff --git a/Downstream/Middlewares/ST/STM32_USB_Host_Library/Core/Src/usbh_core.c b/Downstream/Middlewares/ST/STM32_USB_Host_Library/Core/Src/usbh_core.c
index 8098f3e..80d65d7 100644
--- a/Downstream/Middlewares/ST/STM32_USB_Host_Library/Core/Src/usbh_core.c
+++ b/Downstream/Middlewares/ST/STM32_USB_Host_Library/Core/Src/usbh_core.c
@@ -53,6 +53,10 @@
 #define USBH_ADDRESS_DEFAULT                     0
 #define USBH_ADDRESS_ASSIGNED                    1      
 #define USBH_MPS_DEFAULT                         0x40
+
+#define USBH_ATTACH_DELAY_MS                     200
+#define USBH_DETACH_DELAY_MS                     500
+
 /**
   * @}
   */ 
@@ -410,9 +414,9 @@ USBH_StatusTypeDef  USBH_Process(USBH_HandleTypeDef *phost)
     
     if (phost->device.is_connected)  
     {
-      /* Wait for 200 ms after connection */
+      /* Wait for 200 ms after connection */
       phost->gState = HOST_DEV_WAIT_FOR_ATTACHMENT; 
-      USBH_Delay(200); 
+      USBH_Delay(USBH_ATTACH_DELAY_MS);
       USBH_LL_ResetPort(phost);
 #if (USBH_USE_OS == 1)
       osMessagePut ( phost->os_event, USBH_PORT_EVENT, 0);
@@ -586,9 +590,9 @@ USBH_StatusTypeDef  USBH_Process(USBH_HandleTypeDef *phost)
       phost->pActiveClass->BgndProcess(phost);
     }
     break;       
-
-  case HOST_DEV_DISCONNECTED :
-    
+
+  case HOST_DEV_DISCONNECTED:
+    USBH_Delay(USBH_DETACH_DELAY_MS);
     DeInitStateMachine(phost);  
     
     /* Re-Initilaize Host for new Enumeration */
@@ -596,7 +600,7 @@ USBH_StatusTypeDef  USBH_Process(USBH_HandleTypeDef *phost)
     {
       phost->pActiveClass->DeInit(phost); 
       phost->pActiveClass = NULL;
-    }     
+    }
     break;
     
   case HOST_ABORT_STATE: