diff --git a/test/Assembler/2004-10-22-BCWriterUndefBug.llx b/test/Assembler/2004-10-22-BCWriterUndefBug.llx
index 78ca1ba010f..e1bcfe0bcbb 100644
--- a/test/Assembler/2004-10-22-BCWriterUndefBug.llx
+++ b/test/Assembler/2004-10-22-BCWriterUndefBug.llx
@@ -1,5 +1,5 @@
 ;; The bytecode writer was trying to treat undef values as ConstantArray's when
 ;; they looked like strings.
-
+;; RUN: llvm-as < %s -o /dev/null -f
 %G = internal global [8 x sbyte] undef