diff --git a/RotTable.py b/RotTable.py
index ca025dc7c2e05d0be7acb66136e2b950afd584fb..70f8dd12d50a553255b2b19dc526021112ba9297 100644
--- a/RotTable.py
+++ b/RotTable.py
@@ -20,7 +20,7 @@ class RotTable:
         "TA": [36, 0.9, 0, 1.1, 2, 0],\
         "TC": [36.9, 5.3, -120, 0.9, 6, 0],\
         "TG": [34.5, 3.5, 64, 0.9, 34, 0],\
-        "TT": [35.62, 7.2, -154, 0.06, 0.6, 0]\
+        "TT": [35.62, 7.2, 154, 0.06, 0.6, 0]\
         }
 
     def __init__(self):