diff --git a/openwakeword/utils.py b/openwakeword/utils.py
index c032c5a..8da8048 100644
--- a/openwakeword/utils.py
+++ b/openwakeword/utils.py
@@ -269,8 +269,9 @@ def _get_melspectrogram_batch(self, x, batch_size=128, ncpu=1):
                 result = self._get_melspectrogram(batch)
 
             elif pool:
+                chunksize = batch.shape[0]//ncpu if batch.shape[0] >= ncpu else 1
                 result = np.array(pool.map(self._get_melspectrogram,
-                                           batch, chunksize=batch.shape[0]//ncpu))
+                                           batch, chunksize=chunksize))
 
             melspecs[i:i+batch_size, :, :] = result.squeeze()
 
@@ -330,8 +331,9 @@ def _get_embeddings_batch(self, x, batch_size=128, ncpu=1):
                     result = self.embedding_model_predict(batch)
 
                 elif pool:
+                    chunksize = batch.shape[0]//ncpu if batch.shape[0] >= ncpu else 1
                     result = np.array(pool.map(self._get_embeddings_from_melspec,
-                                      batch, chunksize=batch.shape[0]//ncpu))
+                                      batch, chunksize=chunksize))
 
                 for j, ndx2 in zip(range(0, result.shape[0], n_frames), ndcs):
                     embeddings[ndx2, :, :] = result[j:j+n_frames]