diff --git a/bin/csv-filter b/bin/csv-filter
index 9dab8f4e..c5328171 100755
--- a/bin/csv-filter
+++ b/bin/csv-filter
@@ -16,6 +16,12 @@ Usage: #{parser.program_name} [options]
   and writes that text to the standard output.
 BANNER
 
+
+parser.on('--input-col-sep=SEPARATOR',
+          'Input column separator string.') do |value|
+  options[:input_col_sep] = value
+end
+
 begin
   parser.parse!
 rescue OptionParser::InvalidOption
diff --git a/test/csv/test_csv_filter.rb b/test/csv/test_csv_filter.rb
index 20fbe2af..01e39071 100644
--- a/test/csv/test_csv_filter.rb
+++ b/test/csv/test_csv_filter.rb
@@ -71,4 +71,10 @@ def test_option_v
     assert_equal(["csv-filter #{CSV::VERSION}\n", ""],
                  run_csv_filter("", "-v"))
   end
+
+  def test_option_input_col_sep
+    csv = "aaa:bbb:ccc\nddd:eee:fff\n"
+    assert_equal(["aaa,bbb,ccc\nddd,eee,fff\n", ""],
+                 run_csv_filter(csv, "--input-col-sep=:"))
+  end
 end