diff --git a/test/Index/comment-to-html-xml-conversion.cpp b/test/Index/comment-to-html-xml-conversion.cpp
index b33fa4a..c770ca8 100644
--- a/test/Index/comment-to-html-xml-conversion.cpp
+++ b/test/Index/comment-to-html-xml-conversion.cpp
@@ -19,6 +19,7 @@
 // RUN: FileCheck %s < %t/out.c-index-direct
 // RUN: FileCheck %s < %t/out.c-index-pch
 
+// XFAIL: msan
 // XFAIL: valgrind
 
 #ifndef HEADER