diff --git a/firmware/export/tcc77x.h b/firmware/export/tcc77x.h
index 9ff8adea3e..5346e585aa 100644
--- a/firmware/export/tcc77x.h
+++ b/firmware/export/tcc77x.h
@@ -258,4 +258,7 @@
 /* USB 2.0 device system MMR base address */
 #define USB_BASE 0x90000b00
 
+#define USB_NUM_ENDPOINTS 3
+#define USB_DEVBSS_ATTR   IBSS_ATTR
+
 #endif
diff --git a/firmware/export/tcc780x.h b/firmware/export/tcc780x.h
index 1e2052c4be..b10b311fed 100644
--- a/firmware/export/tcc780x.h
+++ b/firmware/export/tcc780x.h
@@ -229,4 +229,7 @@
 /* USB 2.0 device system MMR base address */
 #define USB_BASE 0xf0010000
 
+#define USB_NUM_ENDPOINTS 3
+#define USB_DEVBSS_ATTR   IBSS_ATTR
+
 #endif
diff --git a/firmware/system.c b/firmware/system.c
index 52be7a1a71..290452b0af 100644
--- a/firmware/system.c
+++ b/firmware/system.c
@@ -24,6 +24,7 @@
 #include "kernel.h"
 #include "thread.h"
 #include "string.h"
+#include "file.h"
 
 #ifndef SIMULATOR
 long cpu_frequency SHAREDBSS_ATTR = CPU_FREQ;
diff --git a/firmware/target/arm/usb-tcc.c b/firmware/target/arm/usb-tcc.c
index aa4c2e4226..6f15e68af8 100644
--- a/firmware/target/arm/usb-tcc.c
+++ b/firmware/target/arm/usb-tcc.c
@@ -122,7 +122,7 @@ void usb_drv_release_endpoint(int ep)
     int flags;
     ep = ep & 0x7f;
 
-    if (ep < 1 || ep > NUM_ENDPOINTS)
+    if (ep < 1 || ep > USB_NUM_ENDPOINTS)
         return ;
 
     flags = disable_irq_save();
@@ -744,6 +744,10 @@ void usb_enable(bool on)
         usb_core_exit();
 }
 
+void usb_attach(void)
+{
+   usb_enable(true);
+}
 
 int usb_detect(void)
 {