diff --git a/lib/rubocop/comment_config.rb b/lib/rubocop/comment_config.rb
index 91f58591ed9..caf6a549ccc 100644
--- a/lib/rubocop/comment_config.rb
+++ b/lib/rubocop/comment_config.rb
@@ -107,7 +107,7 @@ def analyze_rest(analysis, line)
     def cop_line_ranges(analysis)
       return analysis.line_ranges unless analysis.start_line_number
 
-      analysis.line_ranges + [(analysis.start_line_number.to_f..Float::INFINITY)]
+      analysis.line_ranges + [(analysis.start_line_number..Float::INFINITY)]
     end
 
     def each_mentioned_cop