diff --git a/easysock.h b/easysock.h
index a70b21f..f274174 100644
--- a/easysock.h
+++ b/easysock.h
@@ -2,7 +2,9 @@
 #define EASYSOCK_H_
 
 #include <string.h>
+#include <sys/types.h>
 #include <sys/socket.h>
+#include <netdb.h>
 #include <arpa/inet.h>
 #include <stdlib.h>
 #include <stdio.h>
@@ -66,4 +68,8 @@ the given characters is neither of these) and return the appropriate SOCKTYPE va
 
 int char_to_socktype(char transport);
 
+/* inet_to_int - Takes an int value that corresponds to AF_INET or AF_INET6,
+and returns the appropriate int value. */
+int inet_to_int(int af_type);
+
 #endif