diff --git a/pkg/openwsn/include/openwsn_log.h b/pkg/openwsn/include/openwsn_log.h
index 5e0078fc14bd..ef73c348c46d 100644
--- a/pkg/openwsn/include/openwsn_log.h
+++ b/pkg/openwsn/include/openwsn_log.h
@@ -22,6 +22,8 @@
 #ifndef OPENWSN_LOG_H
 #define OPENWSN_LOG_H
 
+#include <stdio.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif