diff --git a/include/swift/Option/Options.td b/include/swift/Option/Options.td
index 60039345147ec..3ddf302a83f6b 100644
--- a/include/swift/Option/Options.td
+++ b/include/swift/Option/Options.td
@@ -810,6 +810,10 @@ def CrossModuleOptimization : Flag<["-"], "cross-module-optimization">,
   Flags<[HelpHidden, FrontendOption]>,
   HelpText<"Perform cross-module optimization">;
 
+def disableCrossModuleOptimization : Flag<["-"], "disable-cmo">,
+  Flags<[HelpHidden, FrontendOption]>,
+  HelpText<"Disable cross-module optimization">;
+
 def ExperimentalPerformanceAnnotations : Flag<["-"], "experimental-performance-annotations">,
   Flags<[HelpHidden, FrontendOption]>,
   HelpText<"Enable experimental performance annotations">;