diff --git a/gcc/lto/ChangeLog b/gcc/lto/ChangeLog
index f1e25db96dade15bce36ae2930e30fd5a38a79bc..fba61ef4ff7826c89838f23cf6105add3e6b0f68 100644
--- a/gcc/lto/ChangeLog
+++ b/gcc/lto/ChangeLog
@@ -1,3 +1,7 @@
+2014-10-06  Martin Liska  <mliska@suse.cz>
+
+	* lto.c (stream_out): ARG_UNUSED added for last argument.
+
 2014-09-24  Aldy Hernandez  <aldyh@redhat.com>
 
 	* lto-symtab.c, lto.c: Rename all instances of DECL_ABSTRACT to
diff --git a/gcc/lto/lto.c b/gcc/lto/lto.c
index 6cbb178db59b1cb51dd8419634353d47cb82be0d..bc53632e14eb2149c85d506c7a11017a1d80de64 100644
--- a/gcc/lto/lto.c
+++ b/gcc/lto/lto.c
@@ -2495,7 +2495,8 @@ wait_for_child ()
    Fork if that seems to help.  */
 
 static void
-stream_out (char *temp_filename, lto_symtab_encoder_t encoder, bool last)
+stream_out (char *temp_filename, lto_symtab_encoder_t encoder,
+	    bool ARG_UNUSED (last))
 {
 #ifdef HAVE_WORKING_FORK
   static int nruns;