diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 22b068d1cc5..e7aa396a6ff 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2014-09-19  Jan Hubicka  <hubicka@ucw.cz>
+
+	PR lto/63286
+	* tree.c (need_assembler_name_p): Do not mangle variadic types.
+
 2014-09-19  Segher Boessenkool  <segher@kernel.crashing.org>
 
 	* recog.c (scratch_operand): Do not simply allow all hard registers:
diff --git a/gcc/tree.c b/gcc/tree.c
index 440e2639d32..83df030b8ad 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -5003,6 +5003,7 @@ need_assembler_name_p (tree decl)
       && decl == TYPE_NAME (TREE_TYPE (decl))
       && !is_lang_specific (TREE_TYPE (decl))
       && AGGREGATE_TYPE_P (TREE_TYPE (decl))
+      && !variably_modified_type_p (TREE_TYPE (decl), NULL_TREE)
       && !type_in_anonymous_namespace_p (TREE_TYPE (decl)))
     return !DECL_ASSEMBLER_NAME_SET_P (decl);
   /* Only FUNCTION_DECLs and VAR_DECLs are considered.  */