diff --git a/src/vigenere/break_vig.py b/src/vigenere/break_vig.py
index d380b9a..a6e8674 100644
--- a/src/vigenere/break_vig.py
+++ b/src/vigenere/break_vig.py
@@ -28,13 +28,14 @@ def crack(substrings, words):
         tree.update(probe(curr, substrings, words))
 
 
-parser = argparse.ArgumentParser()
-parser.add_argument('FILE')
-parser.add_argument('--keylen', type=int, metavar="INT", required=True)
-args = parser.parse_args()
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser()
+    parser.add_argument('FILE')
+    parser.add_argument('--keylen', type=int, metavar="INT", required=True)
+    args = parser.parse_args()
 
-t = ''.join([x for x in open(args.FILE, "r").read().lower() if x.isalpha()])
-substrings = [(t[i:i+args.keylen]) for i in range(0, len(t), args.keylen)]
-words = open(os.path.dirname(__file__)+"/words.txt", "r").read()
+    t = ''.join([x for x in open(args.FILE, "r").read().lower() if x.isalpha()])
+    substrings = [(t[i:i+args.keylen]) for i in range(0, len(t), args.keylen)]
+    words = open(os.path.abspath(os.path.dirname(__file__))+"/words.txt", "r").read()
 
-print(crack(substrings, words))
+    print(crack(substrings, words))