diff --git a/pkg/openwsn/include/openwsn_uart.h b/pkg/openwsn/include/openwsn_uart.h
index 4c4e1cfc4a..a41c65c16d 100644
--- a/pkg/openwsn/include/openwsn_uart.h
+++ b/pkg/openwsn/include/openwsn_uart.h
@@ -28,6 +28,7 @@
 
 #include "stdint.h"
 #include "board.h"
+#include "periph_conf.h"
 
 #ifdef __cplusplus
 extern "C" {