diff --git a/mode/scala.py b/mode/scala.py
index 6c0e2d0..ef358a1 100644
--- a/mode/scala.py
+++ b/mode/scala.py
@@ -39,10 +39,14 @@ class ScalaGrammar(Grammar):
         RegionRule('scala.comment', r'/\*', NestedCommentGrammar, r'\*/'),
         RegionRule('scala.script', r'#!.+$', ShGrammar, r'!#'),
 
-        PatternMatchRule('x', r'(?<=[a-zA-Z0-9_ ])(:)([a-zA-Z0-9_]+)',
+        PatternMatchRule('x', r'(:)([a-zA-Z0-9_]+)',
                          'delimiter', 'scala.type'),
-        PatternMatchRule('x', r'(?<=[a-zA-Z0-9_ ])(:)( +)([a-zA-Z0-9_]+)',
+        PatternMatchRule('x', r'(:)( +)([a-zA-Z0-9_]+)',
                          'delimiter', 'spaces', 'scala.type'),
+        #PatternMatchRule('x', r'(?<=[a-zA-Z0-9_ ])(:)([a-zA-Z0-9_]+)',
+        #                 'delimiter', 'scala.type'),
+        #PatternMatchRule('x', r'(?<=[a-zA-Z0-9_ ])(:)( +)([a-zA-Z0-9_]+)',
+        #                 'delimiter', 'spaces', 'scala.type'),
 
         PatternMatchRule('x', r'(extends)( +)([a-zA-Z0-9_]+)',
                          'scala.reserved', 'spaces', 'scala.type'),