diff --git a/moo/kernel/Socket.moo b/moo/kernel/Socket.moo
index ac98148..32d7176 100644
--- a/moo/kernel/Socket.moo
+++ b/moo/kernel/Socket.moo
@@ -208,20 +208,7 @@ class(#byte(16)) IP6Address(IP4Address)
 	##}
 }
 
-class(#byte(19)) SocketAddress(Object)
-{
-	method(#primitive) port.
-	method(#primitive) port: port.
-
-	method(#primitive) ipaddr.
-	method(#primitive) ipaddr: ipaddr.
-
-	method fromString: str
-	{
-	}
-}
-
-class SocketAddress(Object) from 'sck.addr'
+class(#byte) SocketAddress(Object) from 'sck.addr'
 {
 	##method(#primitive) family.
 	method(#primitive) fromString: str.
@@ -391,6 +378,11 @@ class MyObject(Object)
 	method(#class) main
 	{
 		| s conact inact outact |
+		
+		
+SocketAddress new dump.
+'****************************' dump.
+
 (*
 s:= X new: 20.
 s basicSize dump.
diff --git a/moo/lib/comp.c b/moo/lib/comp.c
index c2f0ce3..3149ac8 100644
--- a/moo/lib/comp.c
+++ b/moo/lib/comp.c
@@ -7728,7 +7728,8 @@ static int __compile_class_definition (moo_t* moo, int extend)
 			 *  this extra module name, i'm free from GC headache */
 			if (moo_importmod (moo, moo->c->cls.self_oop, moo->c->cls.modname.ptr, moo->c->cls.modname.len) <= -1)
 			{
-				set_syntax_error (moo, MOO_SYNERR_MODIMPFAIL, &moo->c->cls.modname_loc, &moo->c->cls.modname);
+				moo_copyoocstr (moo->errmsg.tmpbuf.ooch, MOO_COUNTOF(moo->errmsg.tmpbuf.ooch), moo->errmsg.buf);
+				set_syntax_errbfmt (moo, MOO_SYNERR_MODIMPFAIL, &moo->c->cls.modname_loc, &moo->c->cls.modname, "%js", moo->errmsg.tmpbuf.ooch);
 				return -1;
 			}
 		}
diff --git a/moo/mod/sck-addr.c b/moo/mod/sck-addr.c
index 4ad2aba..d70b8ef 100644
--- a/moo/mod/sck-addr.c
+++ b/moo/mod/sck-addr.c
@@ -25,6 +25,7 @@
  */
  
 #include "_sck.h"
+#include "../lib/moo-prv.h"
 
 #include <sys/types.h>
 #include <sys/socket.h>
@@ -94,7 +95,20 @@ static moo_pfinfo_t pfinfos[] =
 
 static int import (moo_t* moo, moo_mod_t* mod, moo_oop_class_t _class)
 {
-	if (moo_setclasstrsize (moo, _class, MOO_SIZEOF(sck_addr_trailer_t), MOO_NULL) <= -1) return -1;
+	moo_ooi_t spec;
+	/*if (moo_setclasstrsize (moo, _class, MOO_SIZEOF(sck_addr_trailer_t), MOO_NULL) <= -1) return -1;*/
+
+	spec = MOO_OOP_TO_SMOOI(_class->spec);
+	if (!MOO_CLASS_SPEC_IS_INDEXED(spec) || MOO_CLASS_SPEC_INDEXED_TYPE(spec) != MOO_OBJ_TYPE_BYTE || MOO_CLASS_SPEC_NAMED_INSTVARS(spec) != 0)
+	{
+		moo_seterrbfmt (moo, MOO_EINVAL, "%O not a plain byte class", _class);
+		return -1;
+	}
+
+	/* change the number of the fixed fields forcibly */
+/* TODO: check if the super class has what kind of size ... */
+	spec = MOO_CLASS_SPEC_MAKE (10, MOO_CLASS_SPEC_FLAGS(spec), MOO_CLASS_SPEC_INDEXED_TYPE(spec));
+	_class->spec = MOO_SMOOI_TO_OOP(spec);
 	return 0;
 }