diff --git a/kitty/launcher/main.c b/kitty/launcher/main.c
index f10e40366..4077a8080 100644
--- a/kitty/launcher/main.c
+++ b/kitty/launcher/main.c
@@ -434,6 +434,7 @@ handle_option_value:
         }
         exit(0);
     }
+    unsetenv("KITTY_SI_DATA");
     if (opts.single_instance) single_instance_main(argc, argv, &opts);
 }