diff --git a/source/iosuhax_devoptab.c b/source/iosuhax_devoptab.c
index 6ac0580..1ee987b 100644
--- a/source/iosuhax_devoptab.c
+++ b/source/iosuhax_devoptab.c
@@ -22,6 +22,7 @@
  * distribution.
  ***************************************************************************/
 #include <errno.h>
+#include <sys/iosupport.h>
 #include <sys/statvfs.h>
 #include <sys/dirent.h>
 #include <string.h>