diff --git a/Lib/xdrlib.py b/Lib/xdrlib.py
index b293e06..4e48677 100644
--- a/Lib/xdrlib.py
+++ b/Lib/xdrlib.py
@@ -50,7 +50,9 @@
     def pack_uint(self, x):
         self.__buf.write(struct.pack('>L', x))
 
-    pack_int = pack_uint
+    def pack_int(self, x):
+        self.__buf.write(struct.pack('>l', x))
+
     pack_enum = pack_int
 
     def pack_bool(self, x):