diff --git a/gcc/java/ChangeLog b/gcc/java/ChangeLog
index f1aa40e8af4..f986030da96 100644
--- a/gcc/java/ChangeLog
+++ b/gcc/java/ChangeLog
@@ -1,3 +1,8 @@
+2006-01-30  Andrew Haley  <aph@redhat.com>
+
+	PR java/21428
+	* parse.y: (source_start_java_method): Mark DECL_ARTIFICIAL("this").
+
 2006-01-21  Joseph S. Myers  <joseph@codesourcery.com>
 
 	* jv-scan.c (version), jcf-dump.c (version), gjavah.c (version):
diff --git a/gcc/java/parse.y b/gcc/java/parse.y
index a467ff15a79..ab602dd1da4 100644
--- a/gcc/java/parse.y
+++ b/gcc/java/parse.y
@@ -7571,6 +7571,9 @@ source_start_java_method (tree fndecl)
 	  DECL_FINAL (parm_decl) = 1;
 	}
 
+      if (name == this_identifier_node)
+	DECL_ARTIFICIAL (parm_decl) = 1;
+
       BLOCK_CHAIN_DECL (parm_decl);
     }
   tem = BLOCK_EXPR_DECLS (DECL_FUNCTION_BODY (current_function_decl));