diff --git a/NEWS.md b/NEWS.md
index 96ed3ea0..b7ec587e 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,6 +1,10 @@
 1.10.1 -- 2014-MM-DD
 -------------------
 
+Bug fixes:
+
+ - Do not cache non-success jsonp responses (#186)
+
 1.10.0 -- 2014-03-20
 -------------------
 
diff --git a/lib/cartodb/cartodb_windshaft.js b/lib/cartodb/cartodb_windshaft.js
index f3ec9587..23878a7f 100644
--- a/lib/cartodb/cartodb_windshaft.js
+++ b/lib/cartodb/cartodb_windshaft.js
@@ -76,9 +76,14 @@ var CartodbWindshaft = function(serverOptions) {
       var that = this;
       var thatArgs = arguments;
       var statusCode;
-      if ( args.length > 2 ) statusCode = args[2];
-      else {
-        statusCode = args[1] || 200;
+      if ( res._windshaftStatusCode ) {
+        // Added by our override of sendError
+        statusCode = res._windshaftStatusCode;
+      } else {
+        if ( args.length > 2 ) statusCode = args[2];
+        else {
+          statusCode = args[1] || 200;
+        }
       }
       var req = res.req;
       Step (
@@ -117,6 +122,14 @@ var CartodbWindshaft = function(serverOptions) {
       );
     };
 
+    var ws_sendError = ws.sendError;
+    ws.sendError = function() {
+      var res = arguments[0];
+      var statusCode = arguments[2];
+      res._windshaftStatusCode = statusCode;
+      ws_sendError.apply(this, arguments);
+    };
+
     /**
      * Helper to allow access to the layer to be used in the maps infowindow popup.
      */
diff --git a/test/acceptance/server.js b/test/acceptance/server.js
index 0392083a..2066d6de 100644
--- a/test/acceptance/server.js
+++ b/test/acceptance/server.js
@@ -620,6 +620,24 @@ suite('server', function() {
         });
     });
 
+    // See http://github.com/CartoDB/Windshaft-cartodb/issues/186
+    test("get'ing the grid of a private table should fail when unauthenticated (jsonp)",
+    function(done) {
+        assert.response(server, {
+            headers: {host: 'localhost'},
+            url: '/tiles/test_table_private_1/6/31/24.grid.json?callback=x',
+            method: 'GET'
+        },{}, function(res) {
+          // It's forbidden, but jsonp calls for status = 200
+          assert.equal(res.statusCode, 200, res.statusCode + ': ' + res.body);
+          // Still, we do NOT want to add caching headers here
+          // See https://github.com/CartoDB/Windshaft-cartodb/issues/186
+          assert.ok(!res.headers.hasOwnProperty('cache-control'),
+            "Unexpected Cache-Control: " + res.headers['cache-control']);
+          done();
+        });
+    });
+
     // See http://github.com/Vizzuality/Windshaft-cartodb/issues/55
     test("get'ing grid of private table should fail on unknown username",
     function(done) {