diff --git a/lib/rubocop/cop/performance/redundant_equality_comparison_block.rb b/lib/rubocop/cop/performance/redundant_equality_comparison_block.rb
index 4e6ea7006c..d1ef3db49a 100644
--- a/lib/rubocop/cop/performance/redundant_equality_comparison_block.rb
+++ b/lib/rubocop/cop/performance/redundant_equality_comparison_block.rb
@@ -90,13 +90,9 @@ def use_block_argument_in_method_argument_of_operand?(block_argument, operand)
           return false unless operand.send_type?
 
           arguments = operand.arguments
-          operand_sources = arguments.map(&:source)
-
-          arguments.each do |argument|
-            operand_sources += argument.each_descendant(:lvar).map(&:source)
-          end
-
-          operand_sources.any?(block_argument.source)
+          arguments.inject(arguments.map(&:source)) do |operand_sources, argument|
+            operand_sources + argument.each_descendant(:lvar).map(&:source)
+          end.any?(block_argument.source)
         end
 
         def offense_range(node)