diff --git a/libion/include/ion/ion.h b/libion/include/ion/ion.h
index 6ad3ed7..f47793d 100644
--- a/libion/include/ion/ion.h
+++ b/libion/include/ion/ion.h
@@ -21,6 +21,7 @@
 #ifndef __SYS_CORE_ION_H
 #define __SYS_CORE_ION_H
 
+#include <sys/types.h>
 #include <linux/ion.h>
 
 __BEGIN_DECLS