diff --git a/NEWS.md b/NEWS.md
index e70b8df2..db11b9b5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -3,7 +3,8 @@
 ## 4.3.1
 Released 2017-mm-dd
 
-Announcements:
+Bug fix:
+  - Fixed bug introduced in version 4.0.1 that brokes the static map generation using JPG as format
 
 ## 4.3.0
 Released 2017-12-11
diff --git a/lib/cartodb/controllers/layergroup.js b/lib/cartodb/controllers/layergroup.js
index 43dd9c3a..23c0f6cd 100644
--- a/lib/cartodb/controllers/layergroup.js
+++ b/lib/cartodb/controllers/layergroup.js
@@ -357,7 +357,9 @@ LayergroupController.prototype.center = function(req, res, next) {
 
 LayergroupController.prototype.staticMap = function(req, res, width, height, zoom /* bounds */, center, next) {
     var format = req.params.format === 'jpg' ? 'jpeg' : 'png';
-    req.params.format = req.params.format || 'png';
+    // We force always the tile to be generated using PNG because
+    // is the only format we support by now
+    res.locals.format = 'png';
     res.locals.layer = res.locals.layer || 'all';
 
     var self = this;
@@ -507,4 +509,4 @@ function validateLayerRouteMiddleware(req, res, next) {
     }
 
     next();
-}
\ No newline at end of file
+}
diff --git a/lib/cartodb/controllers/named_maps.js b/lib/cartodb/controllers/named_maps.js
index a88c8592..cd2d120f 100644
--- a/lib/cartodb/controllers/named_maps.js
+++ b/lib/cartodb/controllers/named_maps.js
@@ -28,7 +28,7 @@ NamedMapsController.prototype.register = function(app) {
         userMiddleware,
         this.prepareContext,
         this.tile.bind(this),
-        vectorError()        
+        vectorError()
     );
 
     app.get(
@@ -121,7 +121,9 @@ NamedMapsController.prototype.staticMap = function(req, res, next) {
     var cdbUser = res.locals.user;
 
     var format = req.params.format === 'jpg' ? 'jpeg' : 'png';
-    res.locals.format = req.params.format || 'png';
+    // We force always the tile to be generated using PNG because
+    // is the only format we support by now
+    res.locals.format = 'png';
     res.locals.layer = res.locals.layer || 'all';
 
     var namedMapProvider;
diff --git a/test/acceptance/named_maps_static_view.js b/test/acceptance/named_maps_static_view.js
index b7af4197..9844c667 100644
--- a/test/acceptance/named_maps_static_view.js
+++ b/test/acceptance/named_maps_static_view.js
@@ -19,7 +19,8 @@ describe('named maps static view', function() {
     var username = 'localhost';
     var templateName = 'template_with_view';
 
-    var IMAGE_TOLERANCE = 20;
+    var PNG_IMAGE_TOLERANCE = 20;
+    var JPG_IMAGE_TOLERANCE = 100;
 
     function createTemplate(view, layers) {
         return {
@@ -92,8 +93,8 @@ describe('named maps static view', function() {
         });
     }
 
-    function previewFixture(version) {
-        return './test/fixtures/previews/populated_places_simple_reduced-' + version + '.png';
+    function previewFixture(version, format='png') {
+        return './test/fixtures/previews/populated_places_simple_reduced-' + version + '.' + format;
     }
 
     it('should return an image estimating its bounds based on dataset', function (done) {
@@ -103,7 +104,7 @@ describe('named maps static view', function() {
             }
             getStaticMap(function(err, img) {
                 assert.ok(!err);
-                assert.imageIsSimilarToFile(img, previewFixture('estimated'), IMAGE_TOLERANCE, done);
+                assert.imageIsSimilarToFile(img, previewFixture('estimated'), PNG_IMAGE_TOLERANCE, done);
             });
         });
     });
@@ -122,7 +123,7 @@ describe('named maps static view', function() {
             }
             getStaticMap(function(err, img) {
                 assert.ok(!err);
-                assert.imageIsSimilarToFile(img, previewFixture('zoom-center'), IMAGE_TOLERANCE, done);
+                assert.imageIsSimilarToFile(img, previewFixture('zoom-center'), PNG_IMAGE_TOLERANCE, done);
             });
         });
     });
@@ -142,7 +143,7 @@ describe('named maps static view', function() {
             }
             getStaticMap(function(err, img) {
                 assert.ok(!err);
-                assert.imageIsSimilarToFile(img, previewFixture('bounds'), IMAGE_TOLERANCE, done);
+                assert.imageIsSimilarToFile(img, previewFixture('bounds'), PNG_IMAGE_TOLERANCE, done);
             });
         });
     });
@@ -167,7 +168,7 @@ describe('named maps static view', function() {
             }
             getStaticMap(function(err, img) {
                 assert.ok(!err);
-                assert.imageIsSimilarToFile(img, previewFixture('zoom-center'), IMAGE_TOLERANCE, done);
+                assert.imageIsSimilarToFile(img, previewFixture('zoom-center'), PNG_IMAGE_TOLERANCE, done);
             });
         });
     });
@@ -192,7 +193,7 @@ describe('named maps static view', function() {
             }
             getStaticMap({ zoom: 3 }, function(err, img) {
                 assert.ok(!err);
-                assert.imageIsSimilarToFile(img, previewFixture('override-zoom'), IMAGE_TOLERANCE, done);
+                assert.imageIsSimilarToFile(img, previewFixture('override-zoom'), PNG_IMAGE_TOLERANCE, done);
             });
         });
     });
@@ -217,7 +218,7 @@ describe('named maps static view', function() {
             }
             getStaticMap({ bbox: '0,45,90,45' }, function(err, img) {
                 assert.ok(!err);
-                assert.imageIsSimilarToFile(img, previewFixture('override-bbox'), IMAGE_TOLERANCE, done);
+                assert.imageIsSimilarToFile(img, previewFixture('override-bbox'), PNG_IMAGE_TOLERANCE, done);
             });
         });
     });
@@ -256,7 +257,27 @@ describe('named maps static view', function() {
             }
             getStaticMap({ layer: 0 }, function(err, img) {
                 assert.ok(!err);
-                assert.imageIsSimilarToFile(img, previewFixture('bounds'), IMAGE_TOLERANCE, done);
+                assert.imageIsSimilarToFile(img, previewFixture('bounds'), PNG_IMAGE_TOLERANCE, done);
+            });
+        });
+    });
+
+    it('should return jpg static map', function (done) {
+        var view = {
+            zoom: 4,
+            center: {
+                lng: 40,
+                lat: 20
+            }
+        };
+        templateMaps.addTemplate(username, createTemplate(view), function (err) {
+            if (err) {
+                return done(err);
+            }
+            getStaticMap({ format: 'jpeg' }, function(err, img) {
+                assert.ok(!err);
+                assert.imageIsSimilarToFile(img, previewFixture('zoom-center', 'jpeg'),
+                                            JPG_IMAGE_TOLERANCE, done, 'jpeg');
             });
         });
     });
diff --git a/test/fixtures/previews/populated_places_simple_reduced-zoom-center.jpeg b/test/fixtures/previews/populated_places_simple_reduced-zoom-center.jpeg
new file mode 100644
index 00000000..e3f62673
Binary files /dev/null and b/test/fixtures/previews/populated_places_simple_reduced-zoom-center.jpeg differ
diff --git a/test/results/jpeg/.gitignore b/test/results/jpeg/.gitignore
new file mode 100644
index 00000000..c23ac972
--- /dev/null
+++ b/test/results/jpeg/.gitignore
@@ -0,0 +1,3 @@
+*.jpeg
+*.jpg
+*.js
diff --git a/test/support/assert.js b/test/support/assert.js
index bcb186aa..6815a63f 100644
--- a/test/support/assert.js
+++ b/test/support/assert.js
@@ -37,7 +37,7 @@ assert.imageBuffersAreSimilar = function(bufferA, bufferB, tolerance, callback)
     imagesAreSimilar(testImage, referenceImage, tolerance, callback);
 };
 
-assert.imageIsSimilarToFile = function(testImage, referenceImageRelativeFilePath, tolerance, callback) {
+assert.imageIsSimilarToFile = function(testImage, referenceImageRelativeFilePath, tolerance, callback, format='png') {
     callback = callback || function(err) { assert.ifError(err); };
 
     var referenceImageFilePath = path.resolve(referenceImageRelativeFilePath);
@@ -46,19 +46,23 @@ assert.imageIsSimilarToFile = function(testImage, referenceImageRelativeFilePath
 
     imagesAreSimilar(testImage, referenceImage, tolerance, function(err) {
         if (err) {
-            var testImageFilePath = randomImagePath();
-            testImage.save(testImageFilePath);
+            var testImageFilePath = randomImagePath(format);
+            testImage.save(testImageFilePath, format);
         }
         callback(err);
-    });
+    }, format);
 };
 
-function imagesAreSimilar(testImage, referenceImage, tolerance, callback) {
+function imagesAreSimilar(testImage, referenceImage, tolerance, callback, format='png') {
     if (testImage.width() !== referenceImage.width() || testImage.height() !== referenceImage.height()) {
         return callback(new Error('Images are not the same size'));
     }
 
-    var pixelsDifference = referenceImage.compare(testImage);
+    var options = {};
+    if (format === 'jpeg') {
+        options.alpha = false;
+    }
+    var pixelsDifference = referenceImage.compare(testImage, options);
     var similarity = pixelsDifference / (referenceImage.width() * referenceImage.height());
     var tolerancePerMil = (tolerance / 1000);
 
@@ -73,8 +77,8 @@ function imagesAreSimilar(testImage, referenceImage, tolerance, callback) {
     }
 }
 
-function randomImagePath() {
-    return path.resolve('test/results/png/image-test-' + Date.now() + '.png');
+function randomImagePath(format='png') {
+    return path.resolve('test/results/' + format + '/image-test-' + Date.now() + '.' + format);
 }
 
 assert.response = function(server, req, res, callback) {