diff --git a/lib/sass/value/function.rb b/lib/sass/value/function.rb
index 3d412c92..cad01b35 100644
--- a/lib/sass/value/function.rb
+++ b/lib/sass/value/function.rb
@@ -8,8 +8,6 @@ module Value
     class Function
       include Value
 
-      # @overload initialize(id)
-      #   @param id [Numeric]
       # @overload initialize(signature, callback)
       #   @param signature [::String]
       #   @param callback [Proc]
@@ -42,7 +40,7 @@ def ==(other)
 
       # @return [Integer]
       def hash
-        id.nil? ? signature.hash : id.hash
+        @hash ||= id.nil? ? signature.hash : id.hash
       end
 
       # @return [Function]
diff --git a/lib/sass/value/fuzzy_math.rb b/lib/sass/value/fuzzy_math.rb
index c3aa6e2a..5fc6bc63 100644
--- a/lib/sass/value/fuzzy_math.rb
+++ b/lib/sass/value/fuzzy_math.rb
@@ -67,11 +67,11 @@ def assert_between(number, min, max, name)
       end
 
       def hash(number)
-        @hash ||= if number.finite?
-                    (number * INVERSE_EPSILON).round.hash
-                  else
-                    number.hash
-                  end
+        if number.finite?
+          (number * INVERSE_EPSILON).round.hash
+        else
+          number.hash
+        end
       end
     end