diff --git a/src/pio_usb.c b/src/pio_usb.c
index e84b6fa..8ac0c0c 100644
--- a/src/pio_usb.c
+++ b/src/pio_usb.c
@@ -470,7 +470,7 @@ uint8_t __no_inline_not_in_flash_func(pio_usb_ll_encode_tx_data)(
   return byte_idx;
 }
 
-static inline __force_inline void prepare_tx_data(endpoint_t *ep) {
+static __force_inline void prepare_tx_data(endpoint_t *ep) {
   uint16_t const xact_len = pio_usb_ll_get_transaction_len(ep);
   uint8_t buffer[PIO_USB_EP_SIZE + 4];
   buffer[0] = USB_SYNC;
diff --git a/src/pio_usb_host.c b/src/pio_usb_host.c
index 0059ad0..f4d2e23 100644
--- a/src/pio_usb_host.c
+++ b/src/pio_usb_host.c
@@ -401,7 +401,7 @@ void pio_usb_host_close_device(uint8_t root_idx, uint8_t device_address) {
   }
 }
 
-static inline __force_inline endpoint_t * _find_ep(uint8_t root_idx, 
+static __force_inline endpoint_t * _find_ep(uint8_t root_idx,
                                                    uint8_t device_address, uint8_t ep_address) {
   for (int ep_pool_idx = 0; ep_pool_idx < PIO_USB_EP_POOL_CNT; ep_pool_idx++) {
     endpoint_t *ep = PIO_USB_ENDPOINT(ep_pool_idx);
diff --git a/src/pio_usb_ll.h b/src/pio_usb_ll.h
index 3b4ac6d..ae41c1b 100644
--- a/src/pio_usb_ll.h
+++ b/src/pio_usb_ll.h
@@ -140,7 +140,7 @@ pio_usb_bus_get_line_state(root_port_t *root) {
   uint8_t dp = gpio_get(root->pin_dp) ? 0 : 1;
   uint8_t dm = gpio_get(root->pin_dm) ? 0 : 1;
 
-  return (dm << 1) | dp;
+  return (port_pin_status_t)((dm << 1) | dp);
 }
 
 //--------------------------------------------------------------------+
@@ -154,7 +154,7 @@ bool pio_usb_ll_transfer_start(endpoint_t *ep, uint8_t *buffer,
 bool pio_usb_ll_transfer_continue(endpoint_t *ep, uint16_t xferred_bytes);
 void pio_usb_ll_transfer_complete(endpoint_t *ep, uint32_t flag);
 
-static inline __force_inline uint16_t
+static __force_inline uint16_t
 pio_usb_ll_get_transaction_len(endpoint_t *ep) {
   uint16_t remaining = ep->total_len - ep->actual_len;
   return (remaining < ep->size) ? remaining : ep->size;
@@ -203,7 +203,7 @@ bool pio_usb_device_endpoint_open(uint8_t const *desc_endpoint);
 bool pio_usb_device_transfer(uint8_t ep_address, uint8_t *buffer,
                              uint16_t buflen);
 
-static inline __force_inline endpoint_t *
+static __force_inline endpoint_t *
 pio_usb_device_get_endpoint_by_address(uint8_t ep_address) {
   // index = 2*num + dir e.g out1, in1, out2, in2
   uint8_t const ep_idx = ((ep_address & 0x7f) << 1) | (ep_address >> 7);