diff --git a/source/usbcfg.c b/source/usbcfg.c
index e5deaf8..1793e51 100644
--- a/source/usbcfg.c
+++ b/source/usbcfg.c
@@ -32,7 +32,7 @@ static const uint8_t configuration_descriptor_data[41] = {
   /* Configuration Descriptor.*/
   USB_DESC_CONFIGURATION(41,            /* wTotalLength.                    */
                          0x01,          /* bNumInterfaces.                  */
-                         0x00,          /* bConfigurationValue.             */
+                         0x01,          /* bConfigurationValue.             */
                          0,             /* iConfiguration.                  */
                          0xC0,          /* bmAttributes (self powered).     */
                          50),           /* bMaxPower (100mA).               */
@@ -295,8 +295,8 @@ static const USBEndpointConfig ep1config = {
   NULL,
   NULL,
   NULL,
-  0x0040,
-  0x0040,
+  0x0020,
+  0x0020,
   &ep1instate,
   &ep1outstate,
   1,