diff --git a/lib/sass/constant.rb b/lib/sass/constant.rb
index 88fa5650..b9984b73 100644
--- a/lib/sass/constant.rb
+++ b/lib/sass/constant.rb
@@ -102,6 +102,9 @@ module Sass
           str << byte.chr
         end
         
+        if is_string
+          raise Sass::SyntaxError.new("Unterminated string: #{value.dump}")
+        end
         str = reset_str.call
         to_return
       end
diff --git a/test/sass/engine_test.rb b/test/sass/engine_test.rb
index f512fb20..430e2072 100644
--- a/test/sass/engine_test.rb
+++ b/test/sass/engine_test.rb
@@ -9,6 +9,7 @@ class SassEngineTest < Test::Unit::TestCase
     "!a = 1 + " => 'Constant arithmetic error: "1 +"',
     "!a = 1 + 2 +" => 'Constant arithmetic error: "1 + 2 +"',
     "!a = hello \"world\"" => 'Constant arithmetic error: "hello \\"world\\""',
+    "!a = \"b" => 'Unterminated string: "\\"b"',
     "!a = #aaa - a" => 'Undefined operation: "#afafaf minus a"',
     "!a = #aaa / a" => 'Undefined operation: "#afafaf div a"',
     "!a = #aaa * a" => 'Undefined operation: "#afafaf times a"',