diff --git a/mio/lib/mio-skad.h b/mio/lib/mio-skad.h
index 13f1da6..e103f57 100644
--- a/mio/lib/mio-skad.h
+++ b/mio/lib/mio-skad.h
@@ -28,7 +28,7 @@
 #define _MIO_SKAD_H_
 
 #include <mio.h>
-
+#include <mio-utl.h>
 
 #define MIO_SIZEOF_SKAD_T 1
 #if (MIO_SIZEOF_STRUCT_SOCKADDR_IN > MIO_SIZEOF_SKAD_T)