diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 174d62fc89b..c4b114ef254 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2012-07-19  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/53970
+	* tree-vect-data-refs.c (not_size_aligned): Avoid sign-compare
+	warning.
+ 
 2012-07-19  Tristan Gingold  <gingold@adacore.com>
 	    Richard Henderson  <rth@redhat.com>
 
diff --git a/gcc/tree-vect-data-refs.c b/gcc/tree-vect-data-refs.c
index 147fa902cd6..eefd9fa143f 100644
--- a/gcc/tree-vect-data-refs.c
+++ b/gcc/tree-vect-data-refs.c
@@ -1140,7 +1140,7 @@ not_size_aligned (tree exp)
   if (!host_integerp (TYPE_SIZE (TREE_TYPE (exp)), 1))
     return true;
 
-  return (tree_low_cst (TYPE_SIZE (TREE_TYPE (exp)), 1)
+  return (TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (exp)))
 	  > get_object_alignment (exp));
 }