diff --git a/ares_inet_ntop.3 b/ares_inet_ntop.3
index a8e4466..93ee09c 100644
--- a/ares_inet_ntop.3
+++ b/ares_inet_ntop.3
@@ -21,7 +21,7 @@ ares_inet_ntop \- convert a network format address to presentation format
 .B #include <ares.h>
 .PP
 .B const char *
-.B ares_inet_ntop(int af, const void *src, char *dst, socklen_t size);
+.B ares_inet_ntop(int af, const void *src, char *dst, ares_socklen_t size);
 .fi
 .SH DESCRIPTION
 This is a portable version with the identical functionality of the commonly