diff --git a/pyLSV2/dat_cls.py b/pyLSV2/dat_cls.py
index ad8a237..b2e6928 100644
--- a/pyLSV2/dat_cls.py
+++ b/pyLSV2/dat_cls.py
@@ -165,7 +165,7 @@ def __init__(self):
         self.number_of_timers = -1
 
         self.words_start_address = -1
-        self.umber_of_words = -1
+        self.number_of_words = -1
 
         self.strings_start_address = -1
         self.number_of_strings = -1