diff --git a/F1:F103/USB_New_concept/USB_NEW_concept_7inone/usb_dev.h b/F1:F103/USB_New_concept/USB_NEW_concept_7inone/usb_dev.h
index a2926f2..eb954d3 100644
--- a/F1:F103/USB_New_concept/USB_NEW_concept_7inone/usb_dev.h
+++ b/F1:F103/USB_New_concept/USB_NEW_concept_7inone/usb_dev.h
@@ -14,6 +14,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#pragma once
 
 #include <stm32f1.h>
 #include "usb_descr.h"
diff --git a/F1:F103/USB_New_concept/USB_NEW_concept_CDC/usb_dev.h b/F1:F103/USB_New_concept/USB_NEW_concept_CDC/usb_dev.h
index 4c1fced..ea2263e 100644
--- a/F1:F103/USB_New_concept/USB_NEW_concept_CDC/usb_dev.h
+++ b/F1:F103/USB_New_concept/USB_NEW_concept_CDC/usb_dev.h
@@ -14,6 +14,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#pragma once
 
 #include <stm32f1.h>
 #include "usb_lib.h"
diff --git a/F1:F103/USB_New_concept/USB_NEW_concept_HID/usb_dev.h b/F1:F103/USB_New_concept/USB_NEW_concept_HID/usb_dev.h
index 6872a98..7e80063 100644
--- a/F1:F103/USB_New_concept/USB_NEW_concept_HID/usb_dev.h
+++ b/F1:F103/USB_New_concept/USB_NEW_concept_HID/usb_dev.h
@@ -14,6 +14,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#pragma once
 
 #include <stm32f1.h>
 #include "usb_lib.h"
diff --git a/F1:F103/USB_New_concept/USB_NEW_concept_PL2303/usb_dev.h b/F1:F103/USB_New_concept/USB_NEW_concept_PL2303/usb_dev.h
index 4c1fced..ea2263e 100644
--- a/F1:F103/USB_New_concept/USB_NEW_concept_PL2303/usb_dev.h
+++ b/F1:F103/USB_New_concept/USB_NEW_concept_PL2303/usb_dev.h
@@ -14,6 +14,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
+#pragma once
 
 #include <stm32f1.h>
 #include "usb_lib.h"