diff --git a/Lib/fontTools/cu2qu/__main__.py b/Lib/fontTools/cu2qu/__main__.py
index 084bf8f96..5205ffeef 100644
--- a/Lib/fontTools/cu2qu/__main__.py
+++ b/Lib/fontTools/cu2qu/__main__.py
@@ -1,5 +1,5 @@
 import sys
-from .cli import main
+from .cli import _main as main
 
 
 if __name__ == "__main__":
diff --git a/Lib/fontTools/cu2qu/cli.py b/Lib/fontTools/cu2qu/cli.py
index 9144043ff..ddc645020 100644
--- a/Lib/fontTools/cu2qu/cli.py
+++ b/Lib/fontTools/cu2qu/cli.py
@@ -64,7 +64,7 @@ def _copytree(input_path, output_path):
     shutil.copytree(input_path, output_path)
 
 
-def main(args=None):
+def _main(args=None):
     """Convert a UFO font from cubic to quadratic curves"""
     parser = argparse.ArgumentParser(prog="cu2qu")
     parser.add_argument("--version", action="version", version=fontTools.__version__)