diff --git a/src/class/cdc/cdc_host.c b/src/class/cdc/cdc_host.c
index 011ee49dc..d34662cb7 100644
--- a/src/class/cdc/cdc_host.c
+++ b/src/class/cdc/cdc_host.c
@@ -97,7 +97,7 @@ static inline uint8_t get_idx_by_ep_addr(uint8_t daddr, uint8_t ep_addr)
     }
   }
 
-  return TU_INDEX_INVALID_8;
+  return TUSB_INDEX_INVALID_8;
 }
 
 
@@ -124,7 +124,7 @@ uint8_t tuh_cdc_itf_get_index(uint8_t daddr, uint8_t itf_num)
     if (p_cdc->daddr == daddr && p_cdc->bInterfaceNumber == itf_num) return i;
   }
 
-  return TU_INDEX_INVALID_8;
+  return TUSB_INDEX_INVALID_8;
 }
 
 bool tuh_cdc_itf_get_info(uint8_t idx, tuh_cdc_itf_info_t* info)
@@ -533,7 +533,7 @@ static void process_cdc_config(tuh_xfer_t* xfer)
   uintptr_t const state = xfer->user_data;
   uint8_t const itf_num = (uint8_t) tu_le16toh(xfer->setup->wIndex);
   uint8_t const idx = tuh_cdc_itf_get_index(xfer->daddr, itf_num);
-  TU_ASSERT(idx != TU_INDEX_INVALID_8, );
+  TU_ASSERT(idx != TUSB_INDEX_INVALID_8, );
 
   switch(state)
   {
diff --git a/src/class/cdc/cdc_host.h b/src/class/cdc/cdc_host.h
index 4090d0e9f..03f32e542 100644
--- a/src/class/cdc/cdc_host.h
+++ b/src/class/cdc/cdc_host.h
@@ -80,7 +80,7 @@ typedef struct
 } tuh_cdc_itf_info_t;
 
 // Get Interface index from device address + interface number
-// return TUSB_INDEX_INVALID (0xFF) if not found
+// return TUSB_INDEX_INVALID_8 (0xFF) if not found
 uint8_t tuh_cdc_itf_get_index(uint8_t daddr, uint8_t itf_num);
 
 // Get Interface information
diff --git a/src/common/tusb_common.h b/src/common/tusb_common.h
index faccf8726..957491aa9 100644
--- a/src/common/tusb_common.h
+++ b/src/common/tusb_common.h
@@ -75,12 +75,6 @@
 
 #include "tusb_timeout.h" // TODO remove
 
-enum
-{
-  TU_INDEX_INVALID_8 = 0xFFu
-};
-
-
 //--------------------------------------------------------------------+
 // Optional API implemented by application if needed
 // TODO move to a more ovious place/file
diff --git a/src/common/tusb_types.h b/src/common/tusb_types.h
index d567bd482..39a2d4564 100644
--- a/src/common/tusb_types.h
+++ b/src/common/tusb_types.h
@@ -273,6 +273,11 @@ enum
   CONTROL_STAGE_ACK
 };
 
+enum
+{
+  TUSB_INDEX_INVALID_8 = 0xFFu
+};
+
 //--------------------------------------------------------------------+
 // USB Descriptors
 //--------------------------------------------------------------------+
diff --git a/src/host/usbh.c b/src/host/usbh.c
index 9ccbe7557..5a14aea5f 100644
--- a/src/host/usbh.c
+++ b/src/host/usbh.c
@@ -195,7 +195,7 @@ enum { CONFIG_NUM = 1 }; // default to use configuration 1
 // sum of end device + hub
 #define TOTAL_DEVICES   (CFG_TUH_DEVICE_MAX + CFG_TUH_HUB)
 
-static uint8_t _usbh_controller = TU_INDEX_INVALID_8;
+static uint8_t _usbh_controller = TUSB_INDEX_INVALID_8;
 
 // Device with address = 0 for enumeration
 static usbh_dev0_t _dev0;
@@ -303,13 +303,13 @@ tusb_speed_t tuh_speed_get (uint8_t dev_addr)
 static void clear_device(usbh_device_t* dev)
 {
   tu_memclr(dev, sizeof(usbh_device_t));
-  memset(dev->itf2drv, TU_INDEX_INVALID_8, sizeof(dev->itf2drv)); // invalid mapping
-  memset(dev->ep2drv , TU_INDEX_INVALID_8, sizeof(dev->ep2drv )); // invalid mapping
+  memset(dev->itf2drv, TUSB_INDEX_INVALID_8, sizeof(dev->itf2drv)); // invalid mapping
+  memset(dev->ep2drv , TUSB_INDEX_INVALID_8, sizeof(dev->ep2drv )); // invalid mapping
 }
 
 bool tuh_inited(void)
 {
-  return _usbh_controller != TU_INDEX_INVALID_8;
+  return _usbh_controller != TUSB_INDEX_INVALID_8;
 }
 
 bool tuh_init(uint8_t controller_id)
@@ -1033,6 +1033,38 @@ bool tuh_configuration_set(uint8_t daddr, uint8_t config_num,
   return tuh_control_xfer(&xfer);
 }
 
+bool tuh_interface_set(uint8_t daddr, uint8_t itf_num, uint8_t itf_alt,
+                       tuh_xfer_cb_t complete_cb, uintptr_t user_data)
+{
+  TU_LOG_USBH("Set Interface %u Alternate %u\r\n", itf_num, itf_alt);
+
+  tusb_control_request_t const request =
+  {
+    .bmRequestType_bit =
+    {
+      .recipient = TUSB_REQ_RCPT_DEVICE,
+      .type      = TUSB_REQ_TYPE_STANDARD,
+      .direction = TUSB_DIR_OUT
+    },
+    .bRequest = TUSB_REQ_SET_INTERFACE,
+    .wValue   = tu_htole16(itf_alt),
+    .wIndex   = tu_htole16(itf_num),
+    .wLength  = 0
+  };
+
+  tuh_xfer_t xfer =
+  {
+    .daddr       = daddr,
+    .ep_addr     = 0,
+    .setup       = &request,
+    .buffer      = NULL,
+    .complete_cb = complete_cb,
+    .user_data   = user_data
+  };
+
+  return tuh_control_xfer(&xfer);
+}
+
 //--------------------------------------------------------------------+
 // Descriptor Sync
 //--------------------------------------------------------------------+
@@ -1358,11 +1390,11 @@ static void process_enumeration(tuh_xfer_t* xfer)
 
       dev->configured = 1;
 
-      // Start the Set Configuration process for interfaces (itf = TU_INDEX_INVALID_8)
+      // Start the Set Configuration process for interfaces (itf = TUSB_INDEX_INVALID_8)
       // Since driver can perform control transfer within its set_config, this is done asynchronously.
       // The process continue with next interface when class driver complete its sequence with usbh_driver_set_config_complete()
-      // TODO use separated API instead of using TU_INDEX_INVALID_8
-      usbh_driver_set_config_complete(daddr, TU_INDEX_INVALID_8);
+      // TODO use separated API instead of using TUSB_INDEX_INVALID_8
+      usbh_driver_set_config_complete(daddr, TUSB_INDEX_INVALID_8);
     }
     break;
 
@@ -1562,7 +1594,7 @@ static bool _parse_configuration_descriptor(uint8_t dev_addr, tusb_desc_configur
           uint8_t const itf_num = desc_itf->bInterfaceNumber+i;
 
           // Interface number must not be used already
-          TU_ASSERT( TU_INDEX_INVALID_8 == dev->itf2drv[itf_num] );
+          TU_ASSERT( TUSB_INDEX_INVALID_8 == dev->itf2drv[itf_num] );
           dev->itf2drv[itf_num] = drv_id;
         }
 
@@ -1596,7 +1628,7 @@ void usbh_driver_set_config_complete(uint8_t dev_addr, uint8_t itf_num)
     // IAD binding interface such as CDCs should return itf_num + 1 when complete
     // with usbh_driver_set_config_complete()
     uint8_t const drv_id = dev->itf2drv[itf_num];
-    if (drv_id != TU_INDEX_INVALID_8)
+    if (drv_id != TUSB_INDEX_INVALID_8)
     {
       usbh_class_driver_t const * driver = &usbh_class_drivers[drv_id];
       TU_LOG_USBH("%s set config: itf = %u\r\n", driver->name, itf_num);
diff --git a/src/host/usbh.h b/src/host/usbh.h
index 7942de5c2..45e6356bc 100644
--- a/src/host/usbh.h
+++ b/src/host/usbh.h
@@ -171,6 +171,11 @@ bool tuh_edpt_open(uint8_t dev_addr, tusb_desc_endpoint_t const * desc_ep);
 bool tuh_configuration_set(uint8_t daddr, uint8_t config_num,
                            tuh_xfer_cb_t complete_cb, uintptr_t user_data);
 
+// Set Interface (control transfer)
+// true on success, false if there is on-going control transfer or incorrect parameters
+bool tuh_interface_set(uint8_t daddr, uint8_t itf_num, uint8_t itf_alt,
+                       tuh_xfer_cb_t complete_cb, uintptr_t user_data);
+
 //--------------------------------------------------------------------+
 // Descriptors Asynchronous (non-blocking)
 //--------------------------------------------------------------------+