diff --git a/test/libcxx/test/config.py b/test/libcxx/test/config.py
index a821b8f2b..92b000492 100644
--- a/test/libcxx/test/config.py
+++ b/test/libcxx/test/config.py
@@ -419,7 +419,7 @@ class Configuration(object):
                 self.config.available_features.add('tsan')
             else:
                 self.lit_config.fatal('unsupported value for '
-                                      'libcxx_use_san: {0}'.format(san))
+                                      'use_sanitizer: {0}'.format(san))
 
     def configure_triple(self):
         # Get or infer the target triple.