diff --git a/matsim/scenariogen/data/formats/mid.py b/matsim/scenariogen/data/formats/mid.py
index e291dc4..8d159e6 100644
--- a/matsim/scenariogen/data/formats/mid.py
+++ b/matsim/scenariogen/data/formats/mid.py
@@ -236,11 +236,10 @@ def mobile(p):
     @staticmethod
     def present_on_day(p):
         x = int(p.P_STUM)
-        if x == 3:
-            return True
-        elif x == 1 or x == 2:
+        if x == 1 or x == 2:
             return False
-        return None
+
+        return True
 
     @staticmethod
     def parse_time(x):