diff --git a/drivers/include/saul.h b/drivers/include/saul.h
index 1e2bb18ee..bb7cffb37 100644
--- a/drivers/include/saul.h
+++ b/drivers/include/saul.h
@@ -45,6 +45,7 @@
 #define SAUL_H
 
 #include <stdint.h>
+#include <errno.h>
 
 #include "phydat.h"