diff --git a/c/src/lib/include/sys/termios.h b/c/src/lib/include/sys/termios.h
index 3a1d19820c..7cc28d7d38 100644
--- a/c/src/lib/include/sys/termios.h
+++ b/c/src/lib/include/sys/termios.h
@@ -14,6 +14,8 @@
 #ifndef	TERMIOS_H
 #define	TERMIOS_H
 
+#include <sys/types.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif