diff --git a/lib/csv-diff/csv_source.rb b/lib/csv-diff/csv_source.rb
index faec38b..dfa71aa 100644
--- a/lib/csv-diff/csv_source.rb
+++ b/lib/csv-diff/csv_source.rb
@@ -57,7 +57,7 @@ def initialize(source, options = {})
                 @path = source
                 # When you call CSV.open, it's best to pass in a block so that after it's yielded,
                 # the underlying file handle is closed. Otherwise, you risk leaking the handle.
-                @data = CSV.open(@path, mode_string, csv_options) do |csv|
+                @data = CSV.open(@path, mode_string, **csv_options) do |csv|
                      csv.readlines
                 end
             elsif source.is_a?(Enumerable) && source.size == 0 || (source.size > 0 && source.first.is_a?(Enumerable))