diff --git a/whisper/audio.py b/whisper/audio.py
index a3d8a13..de8a195 100644
--- a/whisper/audio.py
+++ b/whisper/audio.py
@@ -113,7 +113,7 @@ def log_mel_spectrogram(audio: Union[str, np.ndarray, torch.Tensor], n_mels: int
 
     window = torch.hann_window(N_FFT).to(audio.device)
     stft = torch.stft(audio, N_FFT, HOP_LENGTH, window=window, return_complex=True)
-    magnitudes = stft[:, :-1].abs() ** 2
+    magnitudes = stft[..., :-1].abs() ** 2
 
     filters = mel_filters(audio.device, n_mels)
     mel_spec = filters @ magnitudes