diff --git a/pyopensprinkler/program.py b/pyopensprinkler/program.py
index 44122a0..68a9108 100644
--- a/pyopensprinkler/program.py
+++ b/pyopensprinkler/program.py
@@ -422,10 +422,10 @@ def get_program_start_time_offset_type(self, start_index):
     def program_start_time_offset_types(self):
         """Retrieve program start time offset types"""
         return [
-            self.program_start_time_offset_type(0),
-            self.program_start_time_offset_type(1),
-            self.program_start_time_offset_type(2),
-            self.program_start_time_offset_type(3),
+            self.get_program_start_time_offset_type(0),
+            self.get_program_start_time_offset_type(1),
+            self.get_program_start_time_offset_type(2),
+            self.get_program_start_time_offset_type(3),
         ]
 
     @property