diff --git a/lib/mysql2psql/postgres_writer.rb b/lib/mysql2psql/postgres_writer.rb
index bd4980e..5befc69 100644
--- a/lib/mysql2psql/postgres_writer.rb
+++ b/lib/mysql2psql/postgres_writer.rb
@@ -127,7 +127,7 @@ def process_row(table, row)
           row[index] = row[index].to_s.gsub('0000-00-00 00:00:00', '1970-01-01 00:00:00')
         end
 
-        if column_type(column) == "boolean"
+        if column[:type] == 'boolean'
           row[index] = (
             case row[index]
             when nil