diff --git a/lib/fluent/plugin/parser_syslog.rb b/lib/fluent/plugin/parser_syslog.rb
index 2b6fcca479..7e424d231d 100644
--- a/lib/fluent/plugin/parser_syslog.rb
+++ b/lib/fluent/plugin/parser_syslog.rb
@@ -314,7 +314,7 @@ def parse_rfc3164(text, &block)
             i = text.index(SPLIT_CHAR, i + 1)
           end
 
-          time_str = sq ? text.slice(idx, i - cursor).squeeze(SPLIT_CHAR) : text.slice(cursor, i - cursor)
+          time_str = sq ? text.slice(cursor, i - cursor).squeeze(SPLIT_CHAR) : text.slice(cursor, i - cursor)
           cursor = i + 1
         end
 
diff --git a/test/plugin/test_parser_syslog.rb b/test/plugin/test_parser_syslog.rb
index dcdbca8388..bbd7fb42f6 100644
--- a/test/plugin/test_parser_syslog.rb
+++ b/test/plugin/test_parser_syslog.rb
@@ -75,6 +75,23 @@ def test_parse_with_priority(param)
     assert_equal("%b %d %H:%M:%S", @parser.instance.patterns['time_format'])
   end
 
+  def test_parse_with_space_padded_rfc3164_timestamp
+    @parser.configure(
+      'parser_engine' => 'string',
+      'with_priority' => true,
+      'time_format' => '%Y-%m-%d %H:%M:%S',
+    )
+
+    result = nil
+    @parser.instance.parse('<6>2020-02-28  12:00:00 192.168.0.1 fluentd[11111]: [error] Syslog test') do |time, record|
+      result = [time, record]
+    end
+
+    time, record = result
+    assert_equal(event_time('2020-02-28 12:00:00', format: '%Y-%m-%d %H:%M:%S'), time)
+    assert_equal(@expected.merge('pri' => 6), record)
+  end
+
   data('regexp' => 'regexp', 'string' => 'string')
   def test_parse_rfc5452_with_priority(param)
     @parser.configure('with_priority' => true, 'parser_type' => param, 'message_format' => 'rfc5424')