diff --git a/ChangeLog b/ChangeLog
index c41185859f..3b7be53c81 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Feb  9 00:44:45 2009  Tanaka Akira  <akr@fsij.org>
+
+	* ext/socket/option.c (sockopt_inspect): add ifdef guard for
+	  LOCAL_PEERCRED.
+
 Mon Feb  9 00:37:06 2009  Tanaka Akira  <akr@fsij.org>
 
 	* ext/socket/option.c (inspect_local_peercred): cr_uid is a effective
diff --git a/ext/socket/option.c b/ext/socket/option.c
index 7bffdf8d6b..ff60cfb53c 100644
--- a/ext/socket/option.c
+++ b/ext/socket/option.c
@@ -326,10 +326,12 @@ sockopt_inspect(VALUE self)
     }
 
     if (family == AF_UNIX && level == 0) {
+#     if defined(LOCAL_PEERCRED)
 	if (optname == LOCAL_PEERCRED) {
 	    if (inspect_local_peercred(level, optname, data, ret) == -1) goto dump;
 	    goto finish;
 	}
+#     endif
     }
 
     switch (level) {