diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 92f290b1052..70d3ad22666 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2012-10-31  Joern Rennecke  <joern.rennecke@embecosm.com>
+
+	* expr.c (can_move_by_pieces): Apply ATTRIBUTE_UNUSED to len.
+
 2012-10-31  Jakub Jelinek  <jakub@redhat.com>
 
 	PR tree-optimization/19105
diff --git a/gcc/expr.c b/gcc/expr.c
index 699dae93d3d..db20e9cb635 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -841,7 +841,7 @@ widest_int_mode_for_size (unsigned int size)
    succeed.  */
 
 int
-can_move_by_pieces (unsigned HOST_WIDE_INT len,
+can_move_by_pieces (unsigned HOST_WIDE_INT len ATTRIBUTE_UNUSED,
 		    unsigned int align ATTRIBUTE_UNUSED)
 {
   return MOVE_BY_PIECES_P (len, align);