diff --git a/json4lua/json/json.lua b/json4lua/json/json.lua
index d95241a..a2e2e17 100755
--- a/json4lua/json/json.lua
+++ b/json4lua/json/json.lua
@@ -332,7 +332,7 @@ end
 function encodeString(s)
   s = string.gsub(s,'\\','\\\\')
   s = string.gsub(s,'"','\\"')
-  s = string.gsub(s,"'","\\'")
+  s = string.gsub(s,'\r','\\r')
   s = string.gsub(s,'\n','\\n')
   s = string.gsub(s,'\t','\\t')
   return s