diff --git a/libcxx/test/support/msvc_stdlib_force_include.h b/libcxx/test/support/msvc_stdlib_force_include.h
--- a/libcxx/test/support/msvc_stdlib_force_include.h
+++ b/libcxx/test/support/msvc_stdlib_force_include.h
@@ -14,7 +14,7 @@
 
 #ifndef _LIBCXX_IN_DEVCRT
     // Silence warnings about CRT machinery.
-    #define _CRT_SECURE_NO_WARNINGS
+    #define _CRT_SECURE_NO_WARNINGS 1
 
     // Avoid assertion dialogs.
     #define _CRT_SECURE_INVALID_PARAMETER(EXPR) ::abort()
diff --git a/libcxx/utils/libcxx/test/config.py b/libcxx/utils/libcxx/test/config.py
--- a/libcxx/utils/libcxx/test/config.py
+++ b/libcxx/utils/libcxx/test/config.py
@@ -272,7 +272,6 @@
         compile_flags_str = self.get_lit_conf('compile_flags', '')
         self.cxx.compile_flags += shlex.split(compile_flags_str)
         if self.target_info.is_windows():
-            # FIXME: Can we remove this?
             self.cxx.compile_flags += ['-D_CRT_SECURE_NO_WARNINGS']
             # Don't warn about using common but nonstandard unprefixed functions
             # like chdir, fileno.