diff --git a/ghost/core/core/server/lib/image/cached-image-size-from-url.js b/ghost/core/core/server/lib/image/cached-image-size-from-url.js
index 61be09ae59..bec2d57d2f 100644
--- a/ghost/core/core/server/lib/image/cached-image-size-from-url.js
+++ b/ghost/core/core/server/lib/image/cached-image-size-from-url.js
@@ -1,10 +1,17 @@
 const debug = require('@tryghost/debug')('utils:image-size-cache');
 const errors = require('@tryghost/errors');
 const logging = require('@tryghost/logging');
+
 class CachedImageSizeFromUrl {
-    constructor({imageSize}) {
+    /**
+     *
+     * @param {Object} options
+     * @param {Object} options.imageSize - instance with "getImageSizeFromUrl" method
+     * @param {Object} options.cache - cache store instance
+     */
+    constructor({imageSize, cache}) {
         this.imageSize = imageSize;
-        this.cache = new Map();
+        this.cache = cache;
     }
 
     /**
@@ -19,31 +26,32 @@ class CachedImageSizeFromUrl {
         if (!url || url === undefined || url === null) {
             return;
         }
-    
+
         // image size is not in cache
         if (!this.cache.has(url)) {
             return this.imageSize.getImageSizeFromUrl(url).then((res) => {
                 this.cache.set(url, res);
-    
+
                 debug('Cached image:', url);
-    
+
                 return this.cache.get(url);
             }).catch(errors.NotFoundError, () => {
                 debug('Cached image (not found):', url);
                 // in case of error we just attach the url
                 this.cache.set(url, url);
-    
+
                 return this.cache.get(url);
             }).catch((err) => {
                 debug('Cached image (error):', url);
                 logging.error(err);
-    
+
                 // in case of error we just attach the url
                 this.cache.set(url, url);
-    
+
                 return this.cache.get(url);
             });
         }
+
         debug('Read image from cache:', url);
         // returns image size from cache
         return this.cache.get(url);
diff --git a/ghost/core/core/server/lib/image/image-utils.js b/ghost/core/core/server/lib/image/image-utils.js
index 23b725d3cc..0ae8e3f5a2 100644
--- a/ghost/core/core/server/lib/image/image-utils.js
+++ b/ghost/core/core/server/lib/image/image-utils.js
@@ -7,7 +7,10 @@ class ImageUtils {
     constructor({config, urlUtils, settingsCache, storageUtils, storage, validator, request}) {
         this.blogIcon = new BlogIcon({config, urlUtils, settingsCache, storageUtils});
         this.imageSize = new ImageSize({config, storage, storageUtils, validator, urlUtils, request});
-        this.cachedImageSizeFromUrl = new CachedImageSizeFromUrl({imageSize: this.imageSize});
+        this.cachedImageSizeFromUrl = new CachedImageSizeFromUrl({
+            imageSize: this.imageSize,
+            cache: new Map()
+        });
         this.gravatar = new Gravatar({config, request});
     }
 }
diff --git a/ghost/core/test/unit/server/lib/image/cached-image-size-from-url.test.js b/ghost/core/test/unit/server/lib/image/cached-image-size-from-url.test.js
index 3495c6bf67..550c9b2b37 100644
--- a/ghost/core/test/unit/server/lib/image/cached-image-size-from-url.test.js
+++ b/ghost/core/test/unit/server/lib/image/cached-image-size-from-url.test.js
@@ -26,11 +26,12 @@ describe('lib/image: image size cache', function () {
             type: 'jpg'
         }));
 
-        const cachedImageSizeFromUrl = new CachedImageSizeFromUrl({logging: {
-            error: () => {}
-        }, imageSize: {
-            getImageSizeFromUrl: sizeOfStub
-        }});
+        const cachedImageSizeFromUrl = new CachedImageSizeFromUrl({
+            imageSize: {
+                getImageSizeFromUrl: sizeOfStub
+            },
+            cache: new Map()
+        });
 
         imageSizeSpy = sizeOfStub;
 
@@ -70,11 +71,12 @@ describe('lib/image: image size cache', function () {
 
         sizeOfStub.returns(new Promise.reject('error'));
 
-        const cachedImageSizeFromUrl = new CachedImageSizeFromUrl({logging: {
-            error: () => {}
-        }, imageSize: {
-            getImageSizeFromUrl: sizeOfStub
-        }});
+        const cachedImageSizeFromUrl = new CachedImageSizeFromUrl({
+            imageSize: {
+                getImageSizeFromUrl: sizeOfStub
+            },
+            cache: new Map()
+        });
 
         cachedImageSizeResult = Promise.resolve(cachedImageSizeFromUrl.getCachedImageSizeFromUrl(url));
         cachedImageSizeResult.then(function () {
@@ -89,7 +91,10 @@ describe('lib/image: image size cache', function () {
     });
 
     it('should return null if url is undefined', function (done) {
-        const cachedImageSizeFromUrl = new CachedImageSizeFromUrl({logging: {}, imageSize: {}});
+        const cachedImageSizeFromUrl = new CachedImageSizeFromUrl({
+            imageSize: {},
+            cache: new Map()
+        });
         const url = null;
         let result;