diff --git a/src/Solver/Mage.py b/src/Solver/Mage.py
index bcb36a88..43a9a036 100644
--- a/src/Solver/Mage.py
+++ b/src/Solver/Mage.py
@@ -806,7 +806,7 @@ class Mage8(Mage):
                     value = "O" if value.lower() == "y" else "N"
 
                 if name == "init_internal":
-                    value = ("p" if value.lower() in ["y", "yes", "true"]
+                    value = ("p" if value.lower() in ["y", "yes", "true", "o"]
                              else "")
 
                 logger.debug(