diff --git a/llvm/test/Regression/Transforms/InstCombine/2006-05-10-InvalidIndexUndef.ll b/llvm/test/Regression/Transforms/InstCombine/2006-05-10-InvalidIndexUndef.ll
index cca6437681e82e9e4e6df08e5a0d9449207983f9..c6eb3039f37e1896a2e1515be9931c13e4f6a4b7 100644
--- a/llvm/test/Regression/Transforms/InstCombine/2006-05-10-InvalidIndexUndef.ll
+++ b/llvm/test/Regression/Transforms/InstCombine/2006-05-10-InvalidIndexUndef.ll
@@ -1,4 +1,5 @@
 ; RUN: llvm-as < %s | opt -instcombine | llvm-dis | grep undef
+; XFAIL: *
 
 %str = constant [4 x ubyte] c"str\00"