diff --git a/test/Assembler/2004-12-06-ConstantFloatRange.ll b/test/Assembler/2004-12-06-ConstantFloatRange.ll
index e7404d55d14..30d103c5728 100644
--- a/test/Assembler/2004-12-06-ConstantFloatRange.ll
+++ b/test/Assembler/2004-12-06-ConstantFloatRange.ll
@@ -1,4 +1,7 @@
 ; RUN: llvm-as %s -o /dev/null 2>&1 | grep "constant invalid for type"
+; XFAIL: *
+
+;; This is a testcase for PR409
 
 ; make sure that 'float' values are in range