diff --git a/lib/sass/constant.rb b/lib/sass/constant.rb
index 790cda37..8c7ab5f8 100644
--- a/lib/sass/constant.rb
+++ b/lib/sass/constant.rb
@@ -101,7 +101,7 @@ module Sass
               symbol = SYMBOLS[byte]
 
               # Adjacent values without an operator should be concatenated
-              if (symbol.nil? || symbol == :open) &&
+              if (symbol.nil? || symbol == :open || symbol == :const) &&
                   last && (!last.is_a?(Symbol) || last == :close)
                 to_return << :concat
               end
diff --git a/lib/sass/engine.rb b/lib/sass/engine.rb
index f1ef400e..c620dc2d 100644
--- a/lib/sass/engine.rb
+++ b/lib/sass/engine.rb
@@ -70,7 +70,7 @@ module Sass
       }.merge! options
       @template = template.split(/\n\r|\n/)
       @lines = []
-      @constants = {}
+      @constants = {"important" => "!important"}
     end
 
     # Processes the template and returns the result as a string.
diff --git a/test/sass/results/constants.css b/test/sass/results/constants.css
index 96c77ee7..1aa6d919 100644
--- a/test/sass/results/constants.css
+++ b/test/sass/results/constants.css
@@ -10,3 +10,5 @@
 #div { num-num: 3.33333333333333; num-num2: 3; col-num: #092345; col-col: #0b0d0f; }
 
 #mod { num-num: 2; col-col: #0f0e05; col-num: #020001; }
+
+#const { escaped-quote: !foo; escaped-slash: !foo; default: Hello! !important; }
diff --git a/test/sass/templates/constants.sass b/test/sass/templates/constants.sass
index 1b8bf2a8..6ae38b46 100644
--- a/test/sass/templates/constants.sass
+++ b/test/sass/templates/constants.sass
@@ -89,3 +89,9 @@
   :col
     :col= #5f6e7d % #10200a
     :num= #aaabac % 3
+
+#const
+  :escaped
+    :quote = "!foo"
+    :slash = \!foo
+  :default = !str !important