diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index c2cd85f375..1bb70e9f0a 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+2000-07-20  Michael Snyder  <msnyder@cleaver.cygnus.com>
+
+	* valarith.c (value_sub): Call check_typedef.
+
 2000-07-19  Nicholas Duffek  <nsd@redhat.com>
 
 	* thread.c (free_thread): New function.
diff --git a/gdb/valarith.c b/gdb/valarith.c
index 2db71fdc93..922bdcc214 100644
--- a/gdb/valarith.c
+++ b/gdb/valarith.c
@@ -110,8 +110,8 @@ value_sub (arg1, arg2)
 				      - (sz * value_as_long (arg2))));
 	}
       else if (TYPE_CODE (type2) == TYPE_CODE_PTR
-	       && TYPE_LENGTH (TYPE_TARGET_TYPE (type1))
-	       == TYPE_LENGTH (TYPE_TARGET_TYPE (type2)))
+	       && TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)))
+	       == TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type2))))
 	{
 	  /* pointer to <type x> - pointer to <type x>.  */
 	  LONGEST sz = TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)));