diff --git a/include/libopencm3/lpc43xx/uart.h b/include/libopencm3/lpc43xx/uart.h
index 7e640f55..5d73100e 100644
--- a/include/libopencm3/lpc43xx/uart.h
+++ b/include/libopencm3/lpc43xx/uart.h
@@ -321,6 +321,8 @@ typedef enum {
 
 /* function prototypes */
 
+BEGIN_DECLS
+
 /* Init UART and set PLL1 as clock source (PCLK) */
 void uart_init(uart_num_t uart_num,
                uart_databit_t data_nb_bits,
@@ -338,4 +340,6 @@ u8 uart_read_timeout(uart_num_t uart_num, u32 rx_timeout_nb_cycles, uart_error_t
 
 void uart_write(uart_num_t uart_num, u8 data);
 
+END_DECLS
+
 #endif