diff --git a/Source/NSGArchiver.m b/Source/NSGArchiver.m
index 6026500a3..7a1071ca5 100644
--- a/Source/NSGArchiver.m
+++ b/Source/NSGArchiver.m
@@ -39,4 +39,10 @@
     }
 }
 
+/* This is the designated initializer */
+- (id) initForWritingWithMutableData: (NSMutableData*)mdata
+{
+  [self initEncodingOnStream:mdata];
+  return self;
+}
 @end