diff --git a/luahook.lua b/luahook.lua
index f9167bc..4ff3116 100644
--- a/luahook.lua
+++ b/luahook.lua
@@ -40,7 +40,7 @@ ser["string"] = function(x)
 	x = string_format("%q", x)
 	x = string_gsub(x, "\n", "n")
 	x = string_gsub(x, "%c", function(c)
-		return "\\00" .. string_format("%02x", string_byte(c))
+		return "\\u00" .. string_format("%02x", string_byte(c))
 	end)
 	return x
 end