diff --git a/src/core/components/user-avatar/user-avatar.ts b/src/core/components/user-avatar/user-avatar.ts
index 5013019e9..cb9a3aadc 100644
--- a/src/core/components/user-avatar/user-avatar.ts
+++ b/src/core/components/user-avatar/user-avatar.ts
@@ -20,8 +20,8 @@ import { CoreEventObserver, CoreEvents } from '@singletons/events';
 import { USER_PROFILE_PICTURE_UPDATED, CoreUserBasicData } from '@features/user/services/user';
 import { CoreNavigator } from '@services/navigator';
 import { CoreNetwork } from '@services/network';
-import { CoreUrl } from '@singletons/url';
 import { CoreUserHelper } from '@features/user/services/user-helper';
+import { CoreUrlUtils } from '@services/utils/url';
 
 /**
  * Component to display a "user avatar".
@@ -111,7 +111,7 @@ export class CoreUserAvatarComponent implements OnInit, OnChanges, OnDestroy {
             this.initials = CoreUserHelper.getUserInitials(this.user);
         }
 
-        if (this.initials && this.avatarUrl && CoreUrl.parse(this.avatarUrl)?.path?.startsWith('/theme/image.php')) {
+        if (this.initials && this.avatarUrl && CoreUrlUtils.isThemeImageUrl(this.avatarUrl)) {
             this.avatarUrl = undefined;
         }
 
diff --git a/src/core/features/question/services/question-helper.ts b/src/core/features/question/services/question-helper.ts
index 2880f5cd2..aad1dd3b8 100644
--- a/src/core/features/question/services/question-helper.ts
+++ b/src/core/features/question/services/question-helper.ts
@@ -27,6 +27,7 @@ import { makeSingleton, Translate } from '@singletons';
 import { CoreQuestion, CoreQuestionProvider, CoreQuestionQuestionParsed, CoreQuestionsAnswers } from './question';
 import { CoreQuestionDelegate } from './question-delegate';
 import { CoreIcons } from '@singletons/icons';
+import { CoreUrlUtils } from '@services/utils/url';
 
 /**
  * Service with some common functions to handle questions.
@@ -678,7 +679,7 @@ export class CoreQuestionHelperProvider {
                 return;
             }
 
-            if (fileUrl.indexOf('theme/image.php') > -1 && fileUrl.indexOf('flagged') > -1) {
+            if (CoreUrlUtils.isThemeImageUrl(fileUrl) && fileUrl.indexOf('flagged') > -1) {
                 // Ignore flag images.
                 return;
             }
diff --git a/src/core/features/user/pages/about/about.ts b/src/core/features/user/pages/about/about.ts
index bf18c2907..a43734ce4 100644
--- a/src/core/features/user/pages/about/about.ts
+++ b/src/core/features/user/pages/about/about.ts
@@ -33,6 +33,7 @@ import { CoreSite } from '@classes/site';
 import { CoreFileUploaderHelper } from '@features/fileuploader/services/fileuploader-helper';
 import { CoreMimetypeUtils } from '@services/utils/mimetype';
 import { Translate } from '@singletons';
+import { CoreUrlUtils } from '@services/utils/url';
 
 /**
  * Page that displays info about a user.
@@ -247,7 +248,7 @@ export class CoreUserAboutPage implements OnInit, OnDestroy {
             return 'undefined';
         }
 
-        if (avatarUrl.startsWith(`${this.site?.siteUrl}/theme/image.php`)) {
+        if (CoreUrlUtils.isThemeImageUrl(avatarUrl, this.site?.siteUrl)) {
             return 'default';
         }
 
diff --git a/src/core/features/user/services/user.ts b/src/core/features/user/services/user.ts
index 3cb7203ee..c18a6034f 100644
--- a/src/core/features/user/services/user.ts
+++ b/src/core/features/user/services/user.ts
@@ -27,7 +27,7 @@ import { CoreStatusWithWarningsWSResponse, CoreWSExternalWarning } from '@servic
 import { CoreError } from '@classes/errors/error';
 import { USERS_TABLE_NAME, CoreUserDBRecord } from './database/user';
 import { CoreUserHelper } from './user-helper';
-import { CoreUrl } from '@singletons/url';
+import { CoreUrlUtils } from '@services/utils/url';
 
 const ROOT_CACHE_KEY = 'mmUser:';
 
@@ -671,7 +671,7 @@ export class CoreUserProvider {
             // Do not prefetch when initials are set and image is default.
             if ('firstname' in entry || 'lastname' in entry) {
                 const initials = CoreUserHelper.getUserInitials(entry);
-                if (initials && imageUrl && CoreUrl.parse(imageUrl)?.path === '/theme/image.php') {
+                if (initials && imageUrl && CoreUrlUtils.isThemeImageUrl(imageUrl)) {
                     return;
                 }
             }
diff --git a/src/core/services/utils/url.ts b/src/core/services/utils/url.ts
index f04f7c922..149630ec6 100644
--- a/src/core/services/utils/url.ts
+++ b/src/core/services/utils/url.ts
@@ -493,11 +493,16 @@ export class CoreUrlUtilsProvider {
     /**
      * Returns if a URL is a theme image URL.
      *
-     * @param url The URL to test.
+     * @param imageUrl The URL to test.
+     * @param siteUrl The Site Url.
      * @returns Whether the URL is a theme image URL.
      */
-    isThemeImageUrl(url: string): boolean {
-        return url?.indexOf('/theme/image.php') !== -1;
+    isThemeImageUrl(imageUrl: string, siteUrl?: string): boolean {
+        if (siteUrl) {
+            return imageUrl.startsWith(`${siteUrl}/theme/image.php`);
+        }
+
+        return imageUrl?.indexOf('/theme/image.php') !== -1;
     }
 
     /**