diff --git a/dmd/mtype.c b/dmd/mtype.c
index ca10d19e..0a33579c 100644
--- a/dmd/mtype.c
+++ b/dmd/mtype.c
@@ -4,6 +4,7 @@
 // All Rights Reserved
 // written by Walter Bright
 // http://www.digitalmars.com
+// http://www.dsource.org/projects/dmd/browser/branches/dmd-1.x/src/mtype.c
 // License for redistribution is by either the Artistic License
 // in artistic.txt, or the GNU General Public License in gnu.txt.
 // See the included readme.txt for details.
@@ -1984,7 +1985,7 @@ Type *TypeSArray::semantic(Loc loc, Scope *sc)
             return this;
         }
         dinteger_t d1 = dim->toInteger();
-        dim = dim->castTo(sc, tsize_t);
+        dim = dim->implicitCastTo(sc, tsize_t);
         dim = dim->optimize(WANTvalue);
         dinteger_t d2 = dim->toInteger();