diff --git a/lib/liquid/tags/case.rb b/lib/liquid/tags/case.rb
index 0f23ead1..8f58d842 100644
--- a/lib/liquid/tags/case.rb
+++ b/lib/liquid/tags/case.rb
@@ -99,7 +99,7 @@ module Liquid
       parser = @parse_context.new_parser(markup)
 
       loop do
-        expr = parser.expression
+        expr = Condition.parse_expression(parser)
         block = Condition.new(@left, '==', expr)
         block.attach(body)
         @blocks << block