diff --git a/Source/NSGArchiver.m b/Source/NSGArchiver.m
index e5465dd98..7e907e2db 100644
--- a/Source/NSGArchiver.m
+++ b/Source/NSGArchiver.m
@@ -1,5 +1,5 @@
 /* Concrete NSArchiver for GNUStep based on GNU Coder class
-   Copyright (C) 1995, 1996 Free Software Foundation, Inc.
+   Copyright (C) 1995, 1996, 1997 Free Software Foundation, Inc.
    
    Written by:  Andrew Kachites McCallum <mccallum@gnu.ai.mit.edu>
    Created: April 1995
@@ -193,6 +193,12 @@
   return "NSGUnarchiver";
 }
 
+- (NSMutableData*) archiverData
+{
+  [self notImplemented: _cmd];
+  return nil;
+}
+
 #undef self
 #endif /* USE_OPENSTEP_STYLE_FORWARD_REFERENCES */