diff --git a/boxes/generators/ottobody.py b/boxes/generators/ottobody.py
index 8b9c3e8..7fc319f 100644
--- a/boxes/generators/ottobody.py
+++ b/boxes/generators/ottobody.py
@@ -62,7 +62,7 @@ class OttoBody(Boxes):
         self.hole(self.x/2-13,self.hl/2, 8)
 
     def IOCB(self):
-        self.rectangularHole(26, 19, 14, 12)
+        self.rectangularHole(26, 18, 12, 10)
         # self.rectangularHole(42.2, 10.2, 9.5, 11.5)
 
     def render(self):