diff --git a/19-defensive/tf-19.py b/19-defensive/tf-19.py
index 7dea0bd..578dce5 100644
--- a/19-defensive/tf-19.py
+++ b/19-defensive/tf-19.py
@@ -64,7 +64,11 @@ def sort(word_freq):
 #
 # The main function
 #
-word_freqs = sort(frequencies(extract_words(sys.argv[1])))
+#if (len(sys.argv) < 2):
+#    filename = "../input.txt"
+#else:
+filename = sys.argv[1] if len(sys.argv) > 1 else "../input.txt"
+word_freqs = sort(frequencies(extract_words(filename)))
 
 for tf in word_freqs[0:25]:
     print tf[0], ' - ', tf[1]