diff --git a/tetromino.py b/tetromino.py
index 4a6c411..079807b 100644
--- a/tetromino.py
+++ b/tetromino.py
@@ -187,7 +187,7 @@ class Tetromino():
                 'i': {0: 9, 1: 8, 2: 9, 3: 8},
                 'a': {0: 9, 1: 8, 2: 9, 3: 8},
                 'b': {0: 9, 1: 8, 2: 9, 3: 8},
-                'c': {0: 10, 1: 10, 2: 10, 3: 10},
+                'c': {0: 9, 1: 9, 2: 9, 3: 9},
                 'o': {0: 9, 1: 9, 2: 9, 3: 9},
                 'd': {0: 9, 1: 9, 2: 9, 3: 9},
                 't': {0: 9, 1: 9, 2: 9, 3: 8},