diff --git a/services/importer/lib/importer/csv_normalizer.rb b/services/importer/lib/importer/csv_normalizer.rb
index f4e2aef02a..967bbb8746 100644
--- a/services/importer/lib/importer/csv_normalizer.rb
+++ b/services/importer/lib/importer/csv_normalizer.rb
@@ -15,7 +15,7 @@ module CartoDB
       LINES_FOR_DETECTION   = 100       # How many lines to read?
       SAMPLE_READ_LIMIT     = 500000   # Read big enough sample bytes for the encoding sampling
       COMMON_DELIMITERS     = [',', "\t", ' ', ';', '|'].freeze
-      DELIMITER_WEIGHTS     = {','=>2, "\t"=>2, ' '=>1, ';'=>2, '|'=>2}
+      DELIMITER_WEIGHTS     = { ',' => 2, "\t" => 2, ' ' => 1, ';' => 2, '|' => 2 }.freeze
       DEFAULT_DELIMITER     = ','
       DEFAULT_ENCODING      = 'UTF-8'
       DEFAULT_QUOTE         = '"'