diff --git a/utils/libcxx/test/config.py b/utils/libcxx/test/config.py
index f63c41dfd..218bee915 100644
--- a/utils/libcxx/test/config.py
+++ b/utils/libcxx/test/config.py
@@ -932,7 +932,7 @@ class Configuration(object):
         self.cxx.addWarningFlagIfSupported('-Wunused-parameter')
         self.cxx.addWarningFlagIfSupported('-Wunreachable-code')
         # FIXME: Enable the two warnings below.
-        self.cxx.addWarningFlagIfSupported('-Wno-conversion')
+        # self.cxx.addWarningFlagIfSupported('-Wno-conversion')
         self.cxx.addWarningFlagIfSupported('-Wno-unused-local-typedef')
         std = self.get_lit_conf('std', None)
         if std in ['c++98', 'c++03']: