diff --git a/lib/coffee_script/lexer.rb b/lib/coffee_script/lexer.rb
index 20f227ca..27f0795e 100644
--- a/lib/coffee_script/lexer.rb
+++ b/lib/coffee_script/lexer.rb
@@ -27,7 +27,7 @@ module CoffeeScript
     COMMENT    = /\A((#[^\n]*\s*)+)/m
     CODE       = /\A(=>)/
     REGEX      = /\A(\/(.*?)[^\\]\/[imgy]{0,4})/
-    MULTI_DENT = /\A((\n+[ \t]*)+)/
+    MULTI_DENT = /\A((\n+([ \t]*(?=\S)))+)/
     LAST_DENT  = /\n+([ \t]*)\Z/
 
     # Token cleaning regexes.
diff --git a/test/fixtures/execution/test_calling_super.coffee b/test/fixtures/execution/test_calling_super.coffee
index d2d6ed0d..8a9d4bc1 100644
--- a/test/fixtures/execution/test_calling_super.coffee
+++ b/test/fixtures/execution/test_calling_super.coffee
@@ -6,12 +6,12 @@ FirstChild: =>
 FirstChild extends Base
 FirstChild.prototype.func: string =>
   super('one/') + string
-
+     
 SecondChild: =>
 SecondChild extends FirstChild
 SecondChild.prototype.func: string =>
   super('two/') + string
-
+   
 ThirdChild: =>
 ThirdChild extends SecondChild
 ThirdChild.prototype.func: string =>