diff --git a/Lib/fontTools/qu2cu/qu2cu.py b/Lib/fontTools/qu2cu/qu2cu.py
index dc65f81b7..f545626a2 100644
--- a/Lib/fontTools/qu2cu/qu2cu.py
+++ b/Lib/fontTools/qu2cu/qu2cu.py
@@ -169,7 +169,7 @@ def add_implicit_on_curves(p):
 
 
 def quadratic_to_curves(
-    quads: List[Tuple[Tuple[float, float], ...]],
+    quads: List[List[Tuple[float, float]]],
     max_err: float = 0.5,
     all_cubic: bool = False,
 ):