diff --git a/core/server/lib/image/image-size.js b/core/server/lib/image/image-size.js
index 0c8672d12f..bfb6b6e57d 100644
--- a/core/server/lib/image/image-size.js
+++ b/core/server/lib/image/image-size.js
@@ -14,7 +14,7 @@ const messages = {
 
 // these are formats supported by image-size but not probe-image-size
 const FETCH_ONLY_FORMATS = [
-    'cur', 'icns', 'ico', 'dds'
+    'cur', 'icns', 'dds'
 ];
 
 class ImageSize {
diff --git a/test/unit/server/lib/image/image-size.test.js b/test/unit/server/lib/image/image-size.test.js
index dd3e51c784..a7cbb2a666 100644
--- a/test/unit/server/lib/image/image-size.test.js
+++ b/test/unit/server/lib/image/image-size.test.js
@@ -127,7 +127,10 @@ describe('lib/image: image size', function () {
                 width: 64
             };
 
-            const requestMock = nock('https://super-website.com').get('/random-path').reply(404);
+            const requestMock = nock('https://super-website.com')
+                .get('/media/icon.ico')
+                .replyWithFile(200, path.join(__dirname, '../../../../utils/fixtures/images/favicon_multi_sizes.ico'));
+            const requestMockNotFound = nock('https://super-website.com').get('/random-path').reply(404);
 
             const imageSize = new ImageSize({config: {
                 get: () => {}
@@ -135,17 +138,11 @@ describe('lib/image: image size', function () {
                 isLocalImage: () => false
             }, validator: {
                 isURL: () => true
-            }, urlUtils: {}, request: (requestUrl) => {
-                if (requestUrl === url) {
-                    return Promise.resolve({
-                        body: fs.readFileSync(path.join(__dirname, '../../../../utils/fixtures/images/favicon_multi_sizes.ico'))
-                    });
-                }
-                return Promise.reject();
-            }});
+            }, urlUtils: {}, request: {}});
 
             imageSize.getImageSizeFromUrl(url).then(function (res) {
-                requestMock.isDone().should.be.false();
+                requestMockNotFound.isDone().should.be.false();
+                requestMock.isDone().should.be.true();
                 should.exist(res);
                 res.width.should.be.equal(expectedImageObject.width);
                 res.height.should.be.equal(expectedImageObject.height);