diff --git a/ChangeLog b/ChangeLog
index 2b4781a2f7..209c68ad99 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Tue May  4 12:38:40 2010  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/option.c (sockopt_inspect): use rb_str_cat2 and
+	  rb_str_append.
+
+	* ext/socket/ancdata.c (ancillary_inspect): refined.
+
 Tue May  4 11:48:06 2010  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/ancdata.c (ancillary_inspect): use rb_str_cat2 and
diff --git a/ext/socket/ancdata.c b/ext/socket/ancdata.c
index 9e93b0457e..880f79cf17 100644
--- a/ext/socket/ancdata.c
+++ b/ext/socket/ancdata.c
@@ -1066,9 +1066,8 @@ ancillary_inspect(VALUE self)
     }
 
     if (!inspected) {
-        data = rb_str_dump(data);
         rb_str_cat2(ret, " ");
-        rb_str_append(ret, data);
+        rb_str_append(ret, rb_str_dump(data));
     }
 
     rb_str_cat2(ret, ">");
diff --git a/ext/socket/option.c b/ext/socket/option.c
index 23afbe21d5..63bffb9f68 100644
--- a/ext/socket/option.c
+++ b/ext/socket/option.c
@@ -633,8 +633,8 @@ sockopt_inspect(VALUE self)
     }
 
     if (!inspected) {
-        data = rb_str_dump(data);
-        rb_str_catf(ret, " %s", StringValueCStr(data));
+        rb_str_cat2(ret, " ");
+        rb_str_append(ret, rb_str_dump(data));
     }
 
     rb_str_cat2(ret, ">");