diff --git a/lib/sass/constant/string.rb b/lib/sass/constant/string.rb
index 70347649..47336e76 100644
--- a/lib/sass/constant/string.rb
+++ b/lib/sass/constant/string.rb
@@ -15,10 +15,18 @@ module Sass::Constant
       Sass::Constant::String.from_value("#{self.to_s}-#{other.to_s}")
     end
 
+    def unary_minus
+      Sass::Constant::String.from_value("-#{self.to_s}")
+    end
+
     def div(other)
       Sass::Constant::String.from_value("#{self.to_s}/#{other.to_s}")
     end
 
+    def unary_div
+      Sass::Constant::String.from_value("/#{self.to_s}")
+    end
+
     def funcall(other)
       Sass::Constant::String.from_value("#{self.to_s}(#{other.to_s})")
     end
diff --git a/test/sass/engine_test.rb b/test/sass/engine_test.rb
index a7710f1e..bc983a7e 100755
--- a/test/sass/engine_test.rb
+++ b/test/sass/engine_test.rb
@@ -145,10 +145,12 @@ class SassEngineTest < Test::Unit::TestCase
 
   def test_string_minus
     assert_equal("foo {\n  bar: baz-boom-bat; }\n", render("foo\n  bar = baz-boom-bat"))
+    assert_equal("foo {\n  bar: -baz-boom; }\n", render("foo\n  bar = -baz-boom"))
   end
 
   def test_string_div
     assert_equal("foo {\n  bar: baz/boom/bat; }\n", render("foo\n  bar = baz/boom/bat"))
+    assert_equal("foo {\n  bar: /baz/boom; }\n", render("foo\n  bar = /baz/boom"))
   end
 
   def test_basic_multiline_selector