diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 9e9032d..6502178 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -11,13 +11,6 @@ Lint/BinaryOperatorWithIdenticalOperands:
   Exclude:
     - 'spec/ruby_units/unit_spec.rb'
 
-# Offense count: 1
-# This cop supports safe autocorrection (--autocorrect).
-# Configuration parameters: AutoCorrect, CheckForMethodsWithNoSideEffects.
-Lint/Void:
-  Exclude:
-    - 'lib/ruby_units/definition.rb'
-
 # Offense count: 2
 # Configuration parameters: EnforcedStyle, CheckMethodNames, CheckSymbols, AllowedIdentifiers, AllowedPatterns.
 # SupportedStyles: snake_case, normalcase, non_integer
diff --git a/lib/ruby_units/definition.rb b/lib/ruby_units/definition.rb
index 49c3a88..1b7a20e 100644
--- a/lib/ruby_units/definition.rb
+++ b/lib/ruby_units/definition.rb
@@ -75,7 +75,6 @@ def definition=(unit)
       @kind        = base.kind
       @numerator   = base.numerator
       @denominator = base.denominator
-      self
     end
 
     # is this definition for a prefix?