diff --git a/TTS/tts/utils/helpers.py b/TTS/tts/utils/helpers.py
index 56ef2944fb..c6d1ec2c06 100644
--- a/TTS/tts/utils/helpers.py
+++ b/TTS/tts/utils/helpers.py
@@ -207,7 +207,7 @@ def maximum_path_numpy(value, mask, max_neg_val=None):
     device = value.device
     dtype = value.dtype
     value = value.cpu().detach().numpy()
-    mask = mask.cpu().detach().numpy().astype(np.bool)
+    mask = mask.cpu().detach().numpy().astype(bool)
 
     b, t_x, t_y = value.shape
     direction = np.zeros(value.shape, dtype=np.int64)