diff --git a/features/unsupported/USBDevice/targets/TARGET_STM/USBHAL_IP_OTGFSHS.h b/features/unsupported/USBDevice/targets/TARGET_STM/USBHAL_IP_OTGFSHS.h
index 594920d5e8..7867b5431e 100644
--- a/features/unsupported/USBDevice/targets/TARGET_STM/USBHAL_IP_OTGFSHS.h
+++ b/features/unsupported/USBDevice/targets/TARGET_STM/USBHAL_IP_OTGFSHS.h
@@ -18,13 +18,12 @@
 #ifndef USBHAL_IP_OTGFSHS_H
 #define USBHAL_IP_OTGFSHS_H
 
-//==================================================================
-// This board has both USB OTG FS and HS connectors.
-// Select one line only.
-//==================================================================
 #if defined(TARGET_DISCO_F746NG)
-//#define TARGET_DISCO_F746NG_OTG_FS
+#if (MBED_CONF_TARGET_USB_SPEED == 1) // Defined in json configuration file
 #define TARGET_DISCO_F746NG_OTG_HS
+#else
+#define TARGET_DISCO_F746NG_OTG_FS
+#endif
 #endif
 
 #if defined(TARGET_DISCO_F429ZI) || \
diff --git a/targets/targets.json b/targets/targets.json
index f51a92d6f2..598637df34 100755
--- a/targets/targets.json
+++ b/targets/targets.json
@@ -1592,6 +1592,10 @@
                 "help": "Mask value : USE_PLL_HSE_EXTC | USE_PLL_HSE_XTAL | USE_PLL_HSI",
                 "value": "USE_PLL_HSE_XTAL|USE_PLL_HSI",
                 "macro_name": "CLOCK_SOURCE"
+            },
+            "usb_speed": {
+                "help": "Select the USB connector (0=FullSpeed, 1=HighSpeed))",
+                "value": "1"
             }
         },
         "detect_code": ["0815"],