diff --git a/over/app.py b/over/app.py
index 11af3e4..6769422 100644
--- a/over/app.py
+++ b/over/app.py
@@ -134,7 +134,11 @@ class Option:
 		
 		if default:
 			if self.default != Option_sources.none:
-				self.set_value(self.default, Option_sources.default)
+				# default values for aggregated options are wrapped in a list
+				default_values = [self.default] if self.overwrite else self.default
+				
+				for default_value in default_values:
+					self.set_value(default_value, Option_sources.default)
 	
 	def set_value(self, raw_value, source):
 		"""