diff --git a/include/btstack/hal_tick.h b/include/btstack/hal_tick.h
index 3d2ab5a64..77d018228 100644
--- a/include/btstack/hal_tick.h
+++ b/include/btstack/hal_tick.h
@@ -40,6 +40,14 @@
 
 #include <stdint.h>
 
+#if defined __cplusplus
+extern "C" {
+#endif
+
 void hal_tick_init(void);
 void hal_tick_set_handler(void (*tick_handler)(void));
 int  hal_tick_get_tick_period_in_ms(void);
+
+#if defined __cplusplus
+}
+#endif
\ No newline at end of file
diff --git a/include/btstack/hal_uart_dma.h b/include/btstack/hal_uart_dma.h
index 408919310..d78162cc0 100644
--- a/include/btstack/hal_uart_dma.h
+++ b/include/btstack/hal_uart_dma.h
@@ -42,6 +42,10 @@
 
 #include <stdint.h>
 
+#if defined __cplusplus
+extern "C" {
+#endif
+
 void hal_uart_dma_init(void);
 void hal_uart_dma_set_block_received( void (*block_handler)(void));
 void hal_uart_dma_set_block_sent( void (*block_handler)(void));
@@ -50,3 +54,7 @@ int  hal_uart_dma_set_baud(uint32_t baud);
 void hal_uart_dma_send_block(const uint8_t *buffer, uint16_t length);
 void hal_uart_dma_receive_block(uint8_t *buffer, uint16_t len);
 void hal_uart_dma_set_sleep(uint8_t sleep);
+
+#if defined __cplusplus
+}
+#endif
\ No newline at end of file