diff --git a/ext/socket/option.c b/ext/socket/option.c
index ff60cfb53c..980acda85d 100644
--- a/ext/socket/option.c
+++ b/ext/socket/option.c
@@ -256,7 +256,7 @@ inspect_peercred(int level, int optname, VALUE data, VALUE ret)
 }
 #endif
 
-#if defined(LOCAL_PEERCRED) /* FreeBSD */
+#if defined(LOCAL_PEERCRED) /* FreeBSD, MacOS X */
 static int
 inspect_local_peercred(int level, int optname, VALUE data, VALUE ret)
 {
diff --git a/test/socket/test_unix.rb b/test/socket/test_unix.rb
index 6b54594736..fb0c47d348 100644
--- a/test/socket/test_unix.rb
+++ b/test/socket/test_unix.rb
@@ -313,7 +313,7 @@ class TestUNIXSocket < Test::Unit::TestCase
   end
 
   def test_getcred_xucred
-    return if /freebsd/ !~ RUBY_PLATFORM
+    return if /freebsd|darwin/ !~ RUBY_PLATFORM
     Dir.mktmpdir {|d|
       sockpath = "#{d}/sock"
       serv = Socket.unix_server_socket(sockpath)