diff --git a/sysdeps/unix/sysv/aix/gethostname.c b/sysdeps/unix/sysv/aix/gethostname.c
index b213c6ffd5..76c8c72d87 100644
--- a/sysdeps/unix/sysv/aix/gethostname.c
+++ b/sysdeps/unix/sysv/aix/gethostname.c
@@ -21,7 +21,7 @@
 int
 __gethostname (name, len)
      char *name;
-     size_t len;
+     socklen_t len;
 {
   return gethostname (name, len);
 }