diff --git a/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM32F769NI.h b/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM32F769NI.h
index 4ef5c58c00..f2bfa7a102 100644
--- a/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM32F769NI.h
+++ b/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM32F769NI.h
@@ -135,7 +135,7 @@ USBHAL::USBHAL(void) {
     /*  bulk/int 64 bytes in FS  */
     HAL_PCDEx_SetTxFiFo(&hpcd, 0, (MAX_PACKET_SIZE_EP0/4)+1);
     /*  bulk/int bytes in FS */
-    HAL_PCDEx_SetTxFiFo(&hpcd, 1, (MAX_PACKET_SIZE_EP1/4));
+    HAL_PCDEx_SetTxFiFo(&hpcd, 1, (MAX_PACKET_SIZE_EP1/4)+1);
     HAL_PCDEx_SetTxFiFo(&hpcd, 2, (MAX_PACKET_SIZE_EP2/4));
     /* ISOchronous */
     HAL_PCDEx_SetTxFiFo(&hpcd, 3, (MAX_PACKET_SIZE_EP3/4));
diff --git a/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM32L476VG.h b/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM32L476VG.h
index e313b2529b..b08bce8b40 100644
--- a/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM32L476VG.h
+++ b/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM32L476VG.h
@@ -131,7 +131,7 @@ USBHAL::USBHAL(void) {
     /*  bulk/int 64 bytes in FS  */
     HAL_PCDEx_SetTxFiFo(&hpcd, 0, (MAX_PACKET_SIZE_EP0/4)+1);
     /*  bulk/int bytes in FS */
-    HAL_PCDEx_SetTxFiFo(&hpcd, 1, (MAX_PACKET_SIZE_EP1/4));
+    HAL_PCDEx_SetTxFiFo(&hpcd, 1, (MAX_PACKET_SIZE_EP1/4)+1);
     HAL_PCDEx_SetTxFiFo(&hpcd, 2, (MAX_PACKET_SIZE_EP2/4));
     /* ISOchronous */
     HAL_PCDEx_SetTxFiFo(&hpcd, 3, (MAX_PACKET_SIZE_EP3/4));
diff --git a/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM_144_64pins.h b/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM_144_64pins.h
index 15fad1af0a..a9d3760448 100644
--- a/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM_144_64pins.h
+++ b/features/unsupported/USBDevice/USBDevice/TARGET_STM/USBHAL_STM_144_64pins.h
@@ -121,7 +121,7 @@ USBHAL::USBHAL(void) {
     /*  bulk/int 64 bytes in FS  */
     HAL_PCDEx_SetTxFiFo(&hpcd, 0, (MAX_PACKET_SIZE_EP0/4)+1);
     /*  bulk/int bytes in FS */
-    HAL_PCDEx_SetTxFiFo(&hpcd, 1, (MAX_PACKET_SIZE_EP1/4));
+    HAL_PCDEx_SetTxFiFo(&hpcd, 1, (MAX_PACKET_SIZE_EP1/4)+1);
     HAL_PCDEx_SetTxFiFo(&hpcd, 2, (MAX_PACKET_SIZE_EP2/4));
     /* ISOchronous */
     HAL_PCDEx_SetTxFiFo(&hpcd, 3, (MAX_PACKET_SIZE_EP3/4));