diff --git a/keyphrase_vectorizers/keyphrase_count_vectorizer.py b/keyphrase_vectorizers/keyphrase_count_vectorizer.py
index d570391..01503ea 100644
--- a/keyphrase_vectorizers/keyphrase_count_vectorizer.py
+++ b/keyphrase_vectorizers/keyphrase_count_vectorizer.py
@@ -505,4 +505,4 @@ def _clean_bow(self) -> None:
         x = np.array(self.keyphrases)
         mask = np.full(len(self.keyphrases), True, dtype=bool)
         mask[indices] = False
-        self.keyphrases = list(x[~mask])
+        self.keyphrases = list(x[~mask])
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