diff --git a/testing/geckodriver/src/marionette.rs b/testing/geckodriver/src/marionette.rs
index d314a4fbe85e0..ca03810f6dd40 100644
--- a/testing/geckodriver/src/marionette.rs
+++ b/testing/geckodriver/src/marionette.rs
@@ -2262,6 +2262,32 @@ to_owned
 )
 )
 ;
+/
+/
+double
+-
+dashed
+flags
+are
+not
+accepted
+on
+Windows
+systems
+runner
+.
+args
+(
+)
+.
+push
+(
+"
+-
+marionette
+"
+)
+;
 if
 let
 Some