diff --git a/lib/sass/tree/attr_node.rb b/lib/sass/tree/attr_node.rb
index f5bba4a4..2d128bf9 100644
--- a/lib/sass/tree/attr_node.rb
+++ b/lib/sass/tree/attr_node.rb
@@ -48,13 +48,13 @@ module Sass::Tree
       end
 
       if value[-1] == ?;
-        raise Sass::SyntaxError.new("Invalid attribute: #{declaration.dump} (This isn't CSS!).", @line)
+        raise Sass::SyntaxError.new("Invalid attribute: #{declaration.dump} (no \";\" required at end-of-line).", @line)
       end
       real_name = name
       real_name = "#{parent_name}-#{real_name}" if parent_name
       
       if value.empty? && children.empty?
-        raise Sass::SyntaxError.new("Invalid attribute: #{declaration.dump}.", @line)
+        raise Sass::SyntaxError.new("Invalid attribute: #{declaration.dump} (no value).", @line)
       end
       
       join_string = case style
@@ -103,7 +103,7 @@ module Sass::Tree
     private
 
     def declaration
-      ":#{name} #{value}"
+      @attr_syntax == :new ? "#{name}: #{value}" : ":#{name} #{value}"
     end
   end
 end
diff --git a/test/sass/engine_test.rb b/test/sass/engine_test.rb
index e771dae6..68ce641d 100755
--- a/test/sass/engine_test.rb
+++ b/test/sass/engine_test.rb
@@ -18,11 +18,13 @@ class SassEngineTest < Test::Unit::TestCase
     ":" => 'Invalid attribute: ":".',
     ": a" => 'Invalid attribute: ": a".',
     ":= a" => 'Invalid attribute: ":= a".',
-    "a\n  :b" => 'Invalid attribute: ":b ".',
+    "a\n  :b" => 'Invalid attribute: ":b " (no value).',
+    "a\n  b:" => 'Invalid attribute: "b: " (no value).',
     "a\n  :b: c" => 'Invalid attribute: ":b: c".',
     "a\n  :b:c d" => 'Invalid attribute: ":b:c d".',
     "a\n  :b=c d" => 'Invalid attribute: ":b=c d".',
-    "a\n  :b c;" => 'Invalid attribute: ":b c;" (This isn\'t CSS!).',
+    "a\n  :b c;" => 'Invalid attribute: ":b c;" (no ";" required at end-of-line).',
+    "a\n  b: c;" => 'Invalid attribute: "b: c;" (no ";" required at end-of-line).',
     "a\n  b : c" => 'Invalid attribute: "b : c".',
     "a\n  b=c: d" => 'Invalid attribute: "b=c: d".',
     ":a" => 'Attributes aren\'t allowed at the root of a document.',