diff --git a/lib/mutant/mutation/filter.rb b/lib/mutant/mutation/filter.rb
index bb495c94..b5d3fc70 100644
--- a/lib/mutant/mutation/filter.rb
+++ b/lib/mutant/mutation/filter.rb
@@ -42,14 +42,14 @@ module Mutant
 
       # Return filter for handle
       #
-      # @param [String] notation
+      # @param [String] _notation
       #
       # @return [nil]
       #   returns nil
       #
       # @api private
       #
-      def self.handle(notation)
+      def self.handle(_notation)
         nil
       end
 
@@ -58,14 +58,14 @@ module Mutant
 
         # Test for match
         #
-        # @pram [Mutation] mutation
+        # @pram [Mutation] _mutation
         #
         # @return [true]
         #   returns true
         #
         # @api private
         #
-        def match?(mutation)
+        def match?(_mutation)
           true
         end
 
diff --git a/lib/mutant/strategy/rspec.rb b/lib/mutant/strategy/rspec.rb
index ec30d57a..4636b3fa 100644
--- a/lib/mutant/strategy/rspec.rb
+++ b/lib/mutant/strategy/rspec.rb
@@ -26,7 +26,7 @@ module Mutant
         #
         # @api private
         #
-        def self.spec_files(mutation)
+        def self.spec_files(_mutation)
           Dir['spec/unit/**/*_spec.rb']
         end
       end # Unit
@@ -40,7 +40,7 @@ module Mutant
         #
         # @api private
         #
-        def self.spec_files(mutation)
+        def self.spec_files(_mutation)
           Dir['spec/integration/**/*_spec.rb']
         end
       end # Integration
@@ -54,7 +54,7 @@ module Mutant
         #
         # @api private
         #
-        def self.spec_files(mutation)
+        def self.spec_files(_mutation)
           Dir['spec/**/*_spec.rb']
         end
       end # Full