diff --git a/app/services/bulk_upload/lettings/year2023/csv_parser.rb b/app/services/bulk_upload/lettings/year2023/csv_parser.rb
index 6b441ab7b..ea686566d 100644
--- a/app/services/bulk_upload/lettings/year2023/csv_parser.rb
+++ b/app/services/bulk_upload/lettings/year2023/csv_parser.rb
@@ -43,8 +43,11 @@ private
   end
 
   def field_numbers
-    # TODO: handle if there are no headers
-    rows[row_offset - 1][col_offset..].map { |h| h.present? ? "field_#{h}" : "field_blank" }
+    if with_headers?
+      rows[row_offset - 1][col_offset..].map { |h| h.present? ? "field_#{h}" : "field_blank" }
+    else
+      default_field_numbers
+    end
   end
 
   def with_headers?
diff --git a/spec/services/bulk_upload/lettings/year2023/csv_parser_spec.rb b/spec/services/bulk_upload/lettings/year2023/csv_parser_spec.rb
index af063e7bf..e8c149329 100644
--- a/spec/services/bulk_upload/lettings/year2023/csv_parser_spec.rb
+++ b/spec/services/bulk_upload/lettings/year2023/csv_parser_spec.rb
@@ -55,25 +55,21 @@ RSpec.describe BulkUpload::Lettings::Year2023::CsvParser do
     end
   end
 
-  # context "when parsing csv without headers" do
-  #   let(:file) { Tempfile.new }
-  #   let(:path) { file.path }
-  #   let(:log) { build(:lettings_log, :completed) }
-
-  #   before do
-  #     file.write(BulkUpload::LogToCsv.new(log:, col_offset: 0).to_2022_csv_row)
-  #     file.rewind
-  #   end
+  context "when parsing csv without headers" do
+    before do
+      file.write(BulkUpload::LogToCsv.new(log:, col_offset: 0).to_2023_csv_row)
+      file.rewind
+    end
 
-  #   it "returns correct offsets" do
-  #     expect(service.row_offset).to eq(0)
-  #     expect(service.col_offset).to eq(0)
-  #   end
+    it "returns correct offsets" do
+      expect(service.row_offset).to eq(0)
+      expect(service.col_offset).to eq(0)
+    end
 
-  #   it "parses csv correctly" do
-  #     expect(service.row_parsers[0].field_12.to_i).to eql(log.age1)
-  #   end
-  # end
+    it "parses csv correctly" do
+      expect(service.row_parsers[0].field_13).to eql(log.tenancycode)
+    end
+  end
 
   # context "when parsing with BOM aka byte order mark" do
   #   let(:file) { Tempfile.new }
diff --git a/spec/support/bulk_upload/log_to_csv.rb b/spec/support/bulk_upload/log_to_csv.rb
index 4ad8f4c98..130494d0f 100644
--- a/spec/support/bulk_upload/log_to_csv.rb
+++ b/spec/support/bulk_upload/log_to_csv.rb
@@ -8,20 +8,20 @@ class BulkUpload::LogToCsv
     @overrides = overrides
   end
 
-  def prefix_offset
+  def row_prefix
     [nil] * col_offset
   end
 
   def to_2022_csv_row
-    (prefix_offset + to_2022_row).flatten.join(",") + line_ending
+    (row_prefix + to_2022_row).flatten.join(",") + line_ending
   end
 
   def to_2023_csv_row(seed: nil)
     if seed
       row = to_2023_row.shuffle(random: Random.new(seed))
-      (prefix_offset + row).flatten.join(",") + line_ending
+      (row_prefix + row).flatten.join(",") + line_ending
     else
-      (prefix_offset + to_2023_row).flatten.join(",") + line_ending
+      (row_prefix + to_2023_row).flatten.join(",") + line_ending
     end
   end