diff --git a/pyroomacoustics/acoustics.py b/pyroomacoustics/acoustics.py
index 78cffe27..e2bf055d 100644
--- a/pyroomacoustics/acoustics.py
+++ b/pyroomacoustics/acoustics.py
@@ -714,7 +714,7 @@ def wavelet_analysis(self, x, band=None, oversampling=2):
         )
 
     def wavelet_synthesis(
-        self, signal: list[np.ndarray], parameters: AntoniOctaveFilterBankParameters
+        self, signal: List[np.ndarray], parameters: AntoniOctaveFilterBankParameters
     ) -> np.ndarray:
         """
         Given the decomposition of the signal by Antoni 2008, compute