diff --git a/examples/cURLv3/post_json.lua b/examples/cURLv3/post_json.lua
new file mode 100644
index 0000000..f41f8f0
--- /dev/null
+++ b/examples/cURLv3/post_json.lua
@@ -0,0 +1,12 @@
+local cURL = require "cURL"
+
+c = cURL.easy{
+  url        = "http://posttestserver.com/post.php",
+  post       = true,
+  httpheader = {
+    "Content-Type: application/json";
+  };
+  postfields = '{"hello": "world"}';
+}
+
+c:perform()
\ No newline at end of file
diff --git a/src/lua/cURL/impl/cURL.lua b/src/lua/cURL/impl/cURL.lua
index dac178c..ea1b7d0 100644
--- a/src/lua/cURL/impl/cURL.lua
+++ b/src/lua/cURL/impl/cURL.lua
@@ -681,7 +681,7 @@ function Multi:setopt(k, v)
   end
 
   if k == curl.OPT_SOCKETFUNCTION then
-    return self:setopt_httppost(wrap_socketfunction(v))
+    return self:setopt_socketfunction(v)
   end
 
   return setopt(self, k, v)