diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 31f324a142b..3239df20cd4 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,9 @@
+2005-11-03  James E Wilson  <wilson@specifix.com>
+
+	PR ada/23427
+        * trans.c (gnat_to_gnu): Use TYPE_SIZE_UNIT not TYPE_SIZE in
+        TREE_OVERFLOW check.
+
 2005-09-21  Olivier Hainque  <hainque@adacore.com>
 
 	PR ada/22418
diff --git a/gcc/ada/trans.c b/gcc/ada/trans.c
index 0e05b6d4731..cd91a368328 100644
--- a/gcc/ada/trans.c
+++ b/gcc/ada/trans.c
@@ -3423,8 +3423,8 @@ gnat_to_gnu (Node_Id gnat_node)
 
       /* If the type has a size that overflows, convert this into raise of
 	 Storage_Error: execution shouldn't have gotten here anyway.  */
-      if (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_lhs))) == INTEGER_CST
-	   && TREE_OVERFLOW (TYPE_SIZE (TREE_TYPE (gnu_lhs))))
+      if (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))) == INTEGER_CST
+	  && TREE_OVERFLOW (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))))
 	gnu_result = build_call_raise (SE_Object_Too_Large);
       else if (Nkind (Expression (gnat_node)) == N_Function_Call
 	       && !Do_Range_Check (Expression (gnat_node)))