diff --git a/app/models/poll/voter.rb b/app/models/poll/voter.rb
index 0826092d2..da05b1bc6 100644
--- a/app/models/poll/voter.rb
+++ b/app/models/poll/voter.rb
@@ -16,7 +16,7 @@ class Poll
     validates :document_number, presence: true, uniqueness: { scope: [:poll_id, :document_type], message: :has_voted }
     validates :origin, inclusion: { in: VALID_ORIGINS }
 
-    before_validation :set_demographic_info, :set_document_info
+    before_validation :set_demographic_info, :set_document_info, :set_denormalized_booth_assignment_id
 
     scope :web,   -> { where(origin: "web") }
     scope :booth, -> { where(origin: "booth") }
@@ -38,6 +38,10 @@ class Poll
 
     private
 
+      def set_denormalized_booth_assignment_id
+        self.booth_assignment_id ||= officer_assignment.try(:booth_assignment_id)
+      end
+
       def in_census?
         census_api_response.valid?
       end