diff --git a/packages/vms/config-vms.h b/packages/vms/config-vms.h
index 726fa4d5d..85eaf6bfc 100644
--- a/packages/vms/config-vms.h
+++ b/packages/vms/config-vms.h
@@ -286,7 +286,7 @@
 #define GETNAMEINFO_TYPE_ARG1 struct sockaddr *
 
 /* Define to the type of arg 2 for getnameinfo. */
-#define GETNAMEINFO_TYPE_ARG2 FIXME
+#define GETNAMEINFO_TYPE_ARG2 size_t
 
 /* Define to the type of args 4 and 6 for getnameinfo. */
 #define GETNAMEINFO_TYPE_ARG46 size_t