diff --git a/lib/sass/constant.rb b/lib/sass/constant.rb
index 7e03c5ee..1dac51ed 100644
--- a/lib/sass/constant.rb
+++ b/lib/sass/constant.rb
@@ -34,7 +34,8 @@ module Sass
     SECOND_ORDER = [:plus, :minus]
   
     class << self    
-      def parse(value, constants)
+      def parse(value, constants, line)
+        @@line = line
         operationalize(parenthesize(tokenize(value)), value, constants).to_s
       end
       
@@ -121,11 +122,13 @@ module Sass
             Literal.parse(insert_constant(value, constants))
           end
         elsif length == 2
-          raise "Syntax error:\n#{original}"
+          raise SyntaxError.new("Constant arithmetic error: #{original}", @@line)
         elsif length == 3
-          Operation.new(operationalize(value[0], original, constants), operationalize(value[2], original, constants), value[1])
+          Operation.new(operationalize(value[0], original, constants), operationalize(value[2], original, constants), value[1], @@line)
         else
-          raise "Syntax error:\n#{original}" unless length >= 5 && length % 2 == 1
+          unless length >= 5 && length % 2 == 1
+            raise SyntaxError.new("Constant arithmetic error: #{original}", @@line)
+          end
           if SECOND_ORDER.include?(value[1]) && FIRST_ORDER.include?(value[3])
             operationalize([value[0], value[1], operationalize(value[2..4], original, constants), *value[5..-1]], original, constants)
           else
@@ -138,7 +141,9 @@ module Sass
         to_return = value
         if value[0] == CONSTANT_CHAR
           to_return = constants[value[1..-1]]
-          raise "Undefined constant:\n#{value}" unless to_return
+          unless to_return
+            raise SyntaxError.new("Undefined constant: #{value}", @@line)
+          end
         end
         to_return
       end
diff --git a/lib/sass/constant/operation.rb b/lib/sass/constant/operation.rb
index f4e2e4c7..2dec5d26 100644
--- a/lib/sass/constant/operation.rb
+++ b/lib/sass/constant/operation.rb
@@ -4,10 +4,11 @@ require 'sass/constant/color'
 
 module Sass::Constant
   class Operation
-    def initialize(operand1, operand2, operator)
+    def initialize(operand1, operand2, operator, line)
       @operand1 = operand1
       @operand2 = operand2
       @operator = operator
+      @line = line
     end
     
     def to_s
@@ -23,7 +24,7 @@ module Sass::Constant
         literal1.send(@operator, literal2)
       rescue NoMethodError => e
         raise e unless e.name == @operator        
-        raise "Undefined operation:\n#{literal1} #{@operator} #{literal2}\n"
+        raise Sass::SyntaxError.new("Undefined operation: #{literal1} #{@operator} #{literal2}", @line)
       end
     end
   end
diff --git a/lib/sass/engine.rb b/lib/sass/engine.rb
index 147b23e9..f7f41b42 100644
--- a/lib/sass/engine.rb
+++ b/lib/sass/engine.rb
@@ -142,7 +142,7 @@ module Sass
       
       if name[-1] == SCRIPT_CHAR
         name.slice!(-1)
-        value = Sass::Constant.parse(value, @constants).to_s
+        value = Sass::Constant.parse(value, @constants, @line).to_s
       end
       
       Tree::AttrNode.new(name, value)
@@ -153,7 +153,7 @@ module Sass
       unless name && value
         raise SyntaxError.new("Invalid constant: #{line}", @line)
       end
-      @constants[name] = Sass::Constant.parse(value, @constants)
+      @constants[name] = Sass::Constant.parse(value, @constants, @line)
       nil
     end
   end
diff --git a/test/sass/engine_test.rb b/test/sass/engine_test.rb
index a417b937..9540c848 100644
--- a/test/sass/engine_test.rb
+++ b/test/sass/engine_test.rb
@@ -6,16 +6,16 @@ require 'sass/engine'
 
 class SassEngineTest < Test::Unit::TestCase
   EXCEPTION_MAP = {
-    "!a = 1 + " => "Syntax error:\n1 +",
-    "!a = 1 + 2 +" => "Syntax error:\n1 + 2 +",
-    "!a = #aaa - a" => "Undefined operation:\n#afafaf minus a",
-    "!a = #aaa / a" => "Undefined operation:\n#afafaf div a",
-    "!a = #aaa * a" => "Undefined operation:\n#afafaf times a",
-    "!a = #aaa % a" => "Undefined operation:\n#afafaf mod a",
-    "!a = 1 - a" => "Undefined operation:\n1 minus a",
-    "!a = 1 * a" => "Undefined operation:\n1 times a",
-    "!a = 1 / a" => "Undefined operation:\n1 div a",
-    "!a = 1 % a" => "Undefined operation:\n1 mod a",
+    "!a = 1 + " => "Constant arithmetic error: 1 +",
+    "!a = 1 + 2 +" => "Constant arithmetic error: 1 + 2 +",
+    "!a = #aaa - a" => "Undefined operation: #afafaf minus a",
+    "!a = #aaa / a" => "Undefined operation: #afafaf div a",
+    "!a = #aaa * a" => "Undefined operation: #afafaf times a",
+    "!a = #aaa % a" => "Undefined operation: #afafaf mod a",
+    "!a = 1 - a" => "Undefined operation: 1 minus a",
+    "!a = 1 * a" => "Undefined operation: 1 times a",
+    "!a = 1 / a" => "Undefined operation: 1 div a",
+    "!a = 1 % a" => "Undefined operation: 1 mod a",
   }
   
   def test_basic_render
@@ -24,11 +24,13 @@ class SassEngineTest < Test::Unit::TestCase
   
   def test_exceptions
     EXCEPTION_MAP.each do |key, value|
-      val_lines = value.split("\n")
       begin
         Sass::Engine.new(key).render
-      rescue RuntimeError => res_lines; end
-      val_lines.zip(res_lines.to_s.split("\n")) { |val, res| assert_equal(val, res) }
+      rescue Sass::SyntaxError => err
+        assert_equal(value, err.message)
+      else
+        assert(false, "Exception not raised!")
+      end
     end
   end
   
diff --git a/test/sass/plugin_test.rb b/test/sass/plugin_test.rb
index 47389a86..999d8b1e 100644
--- a/test/sass/plugin_test.rb
+++ b/test/sass/plugin_test.rb
@@ -35,7 +35,7 @@ class SassPluginTest < Test::Unit::TestCase
   
   def test_exception_handling
     File.open(tempfile_loc('bork')) do |file|
-      assert file.gets + file.gets == "Undefined constant:\n!bork\n"
+      assert_equal("Undefined constant: !bork", file.gets.strip)
     end
     File.delete(tempfile_loc('bork'))
     Sass.const_set('RAILS_ENV', 'production')