diff --git a/lib/drb/extserv.rb b/lib/drb/extserv.rb
index a93d5d1..9523fe8 100644
--- a/lib/drb/extserv.rb
+++ b/lib/drb/extserv.rb
@@ -18,7 +18,7 @@ def initialize(there, name, server=nil)
       @name = name
       ro = DRbObject.new(nil, there)
       synchronize do
-        @invoker = ro.regist(name, DRbObject.new(self, @server.uri))
+        @invoker = ro.register(name, DRbObject.new(self, @server.uri))
       end
     end
     attr_reader :server
@@ -29,7 +29,7 @@ def front
 
     def stop_service
       synchronize do
-        @invoker.unregist(@name)
+        @invoker.unregister(@name)
         server = @server
         @server = nil
         server.stop_service
diff --git a/lib/drb/extservm.rb b/lib/drb/extservm.rb
index 040e4e3..9333a10 100644
--- a/lib/drb/extservm.rb
+++ b/lib/drb/extservm.rb
@@ -44,19 +44,21 @@ def service(name)
       end
     end
 
-    def regist(name, ro)
+    def register(name, ro)
       synchronize do
         @servers[name] = ro
         @cond.signal
       end
       self
     end
+    alias regist register
 
-    def unregist(name)
+    def unregister(name)
       synchronize do
         @servers.delete(name)
       end
     end
+    alias unregist unregister
 
     private
     def invoke_thread