diff --git a/ngrams/term_frequencies.py b/ngrams/term_frequencies.py
index 30ad5eb..f901906 100755
--- a/ngrams/term_frequencies.py
+++ b/ngrams/term_frequencies.py
@@ -195,6 +195,7 @@ def weekly_tf(partition,
     outchunksize = 100000
 
     Path(output_terms_path).mkdir(parents=True, exist_ok=True)
+    Path(output_authors_path).mkdir(parents=True, exist_ok=True)
 
     if limit is not None:
         n_lines_out = 0