diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 6d590239f4eae33b5228fcbab51207631f5543bf..06e5fec236f1c5e822ce6b199fd14be9f56e9689 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,8 +1,14 @@
+2006-09-07  Jason Merrill  <jason@redhat.com>
+
+	PR c++/26957
+	* method.c (use_thunk): Clear DECL_HAS_VALUE_EXPR_P on copied
+	parms.
+
 2006-09-07  Simon Martin  <simartin@users.sourceforge.net>
 
 	PR c++/28284
-	* pt.c (fold_non_dependent_expr): Make sure expr is not dereferenced if it
-	is NULL.
+	* pt.c (fold_non_dependent_expr): Make sure expr is not
+	dereferenced if it is NULL.
 
 2006-09-06  Zak Kipling  <zak@transversal.com>
 
diff --git a/gcc/cp/method.c b/gcc/cp/method.c
index 312e3a9c04a174860ce90dba59a3f83491ddfbf0..e2106fff55c26d697c06f6d04091339081eb0b92 100644
--- a/gcc/cp/method.c
+++ b/gcc/cp/method.c
@@ -419,6 +419,7 @@ use_thunk (tree thunk_fndecl, bool emit_p)
       TREE_CHAIN (x) = t;
       DECL_CONTEXT (x) = thunk_fndecl;
       SET_DECL_RTL (x, NULL_RTX);
+      DECL_HAS_VALUE_EXPR_P (x) = 0;
       t = x;
     }
   a = nreverse (t);
diff --git a/gcc/testsuite/g++.dg/inherit/thunk6.C b/gcc/testsuite/g++.dg/inherit/thunk6.C
new file mode 100644
index 0000000000000000000000000000000000000000..b8e316d087b6a663878964b3832549fccc77cc89
--- /dev/null
+++ b/gcc/testsuite/g++.dg/inherit/thunk6.C
@@ -0,0 +1,16 @@
+// PR c++/26957
+
+struct LongDouble {
+    char ld[16];
+};
+
+struct DynAny  {
+    virtual void insert_longdouble(LongDouble value) = 0;
+};
+
+struct TAO_DynCommon : public virtual DynAny {
+    virtual void insert_longdouble (LongDouble value);
+};
+
+void TAO_DynCommon::insert_longdouble (LongDouble value) { }
+