diff --git a/setup.py b/setup.py
index 2af4bbde..b5b1af3a 100644
--- a/setup.py
+++ b/setup.py
@@ -603,7 +603,7 @@ cx_Freeze.setup(
     ext_modules=cythonize("_speedups.pyx"),
     options={
         "build_exe": {
-            "packages": ["worlds", "kivy", "cymem"],
+            "packages": ["worlds", "kivy", "cymem", "websockets"],
             "includes": [],
             "excludes": ["numpy", "Cython", "PySide2", "PIL",
                          "pandas"],