diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index c0c3cece95be..d78db3bc3173 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2016-01-11  Martin Jambor  <mjambor@suse.cz>
+
+	PR ipa/66616
+	* cgraphclones.c (duplicate_thunk_for_node): Copy can_change_signature
+	flag.
+
 2016-01-11  Tom de Vries  <tom@codesourcery.com>
 
 	PR tree-optimization/69109
diff --git a/gcc/cgraphclones.c b/gcc/cgraphclones.c
index 1044b3f8d26b..354655e85d20 100644
--- a/gcc/cgraphclones.c
+++ b/gcc/cgraphclones.c
@@ -328,6 +328,7 @@ duplicate_thunk_for_node (cgraph_node *thunk, cgraph_node *node)
   new_thunk = cgraph_node::create (new_decl);
   set_new_clone_decl_and_node_flags (new_thunk);
   new_thunk->definition = true;
+  new_thunk->local.can_change_signature = node->local.can_change_signature;
   new_thunk->thunk = thunk->thunk;
   new_thunk->unique_name = in_lto_p;
   new_thunk->former_clone_of = thunk->decl;