diff --git a/lib/rb/lib/thrift/transport/ttransport.rb b/lib/rb/lib/thrift/transport/ttransport.rb
index 781db83..bdf0935 100644
--- a/lib/rb/lib/thrift/transport/ttransport.rb
+++ b/lib/rb/lib/thrift/transport/ttransport.rb
@@ -210,8 +210,8 @@
   def initialize(sz=1024)
     @buf = ''
     @sz  = sz
-    wpos = 0
-    rpos = 0
+    @wpos = 0
+    @rpos = 0
   end
 
   def isOpen
@@ -225,7 +225,7 @@
   end
 
   def peek
-    return rpos < wpos
+    return @rpos < @wpos
   end
 
   def getBuffer