diff --git a/mod/dfrn_confirm.php b/mod/dfrn_confirm.php
index bd52a67cff..e909428d1e 100644
--- a/mod/dfrn_confirm.php
+++ b/mod/dfrn_confirm.php
@@ -481,7 +481,7 @@ function dfrn_confirm_post(App $a, $handsfree = null)
 		if (DBA::isResult($contact)) {
 			$photo = $contact['photo'];
 		} else {
-			$photo = DI::baseUrl() . '/images/person-300.jpg';
+			$photo = DI::baseUrl() . Contact::DEFAULT_AVATAR_PHOTO;
 		}
 
 		Contact::updateAvatar($dfrn_record, $photo);
diff --git a/src/Content/Nav.php b/src/Content/Nav.php
index 335f81bf3d..9e34cefc75 100644
--- a/src/Content/Nav.php
+++ b/src/Content/Nav.php
@@ -27,6 +27,7 @@ use Friendica\Core\Renderer;
 use Friendica\Core\Session;
 use Friendica\Database\DBA;
 use Friendica\DI;
+use Friendica\Model\Contact;
 use Friendica\Model\Profile;
 use Friendica\Model\User;
 
@@ -183,7 +184,7 @@ class Nav
 				// user info
 				$contact = DBA::selectFirst('contact', ['micro'], ['uid' => $a->user['uid'], 'self' => true]);
 				$userinfo = [
-					'icon' => (DBA::isResult($contact) ? DI::baseUrl()->remove($contact['micro']) : 'images/person-48.jpg'),
+					'icon' => (DBA::isResult($contact) ? DI::baseUrl()->remove($contact['micro']) : Contact::DEFAULT_AVATAR_MICRO),
 					'name' => $a->user['username'],
 				];
 			} else {
diff --git a/src/Factory/Notification/Introduction.php b/src/Factory/Notification/Introduction.php
index a16926f967..efee886f91 100644
--- a/src/Factory/Notification/Introduction.php
+++ b/src/Factory/Notification/Introduction.php
@@ -132,7 +132,7 @@ class Introduction extends BaseFactory
 						'madeby_zrl'     => Contact::magicLink($notification['url']),
 						'madeby_addr'    => $notification['addr'],
 						'contact_id'     => $notification['contact-id'],
-						'photo'          => (!empty($notification['fphoto']) ? Proxy::proxifyUrl($notification['fphoto'], false, Proxy::SIZE_SMALL) : "images/person-300.jpg"),
+						'photo'          => (!empty($notification['fphoto']) ? Proxy::proxifyUrl($notification['fphoto'], false, Proxy::SIZE_SMALL) : Contact::DEFAULT_AVATAR_PHOTO),
 						'name'           => $notification['fname'],
 						'url'            => $notification['furl'],
 						'zrl'            => Contact::magicLink($notification['furl']),
diff --git a/src/Model/Contact.php b/src/Model/Contact.php
index 0e3b5724cb..53bd894744 100644
--- a/src/Model/Contact.php
+++ b/src/Model/Contact.php
@@ -51,6 +51,10 @@ use Friendica\Util\Strings;
  */
 class Contact
 {
+	const DEFAULT_AVATAR_PHOTO = '/images/person-300.jpg';
+	const DEFAULT_AVATAR_THUMB = '/images/person-80.jpg';
+	const DEFAULT_AVATAR_MICRO = '/images/person-48.jpg';
+
 	/**
 	 * @deprecated since version 2019.03
 	 * @see User::PAGE_FLAGS_NORMAL
@@ -644,9 +648,9 @@ class Contact
 			$fields['micro'] = $prefix . '6' . $suffix;
 		} else {
 			// We hadn't found a photo entry, so we use the default avatar
-			$fields['photo'] = DI::baseUrl() . '/images/person-300.jpg';
-			$fields['thumb'] = DI::baseUrl() . '/images/person-80.jpg';
-			$fields['micro'] = DI::baseUrl() . '/images/person-48.jpg';
+			$fields['photo'] = DI::baseUrl() . self::DEFAULT_AVATAR_PHOTO;
+			$fields['thumb'] = DI::baseUrl() . self::DEFAULT_AVATAR_THUMB;
+			$fields['micro'] = DI::baseUrl() . self::DEFAULT_AVATAR_MICRO;
 		}
 
 		$fields['avatar'] = DI::baseUrl() . '/photo/profile/' .$uid . '.' . $file_suffix;
@@ -1467,7 +1471,7 @@ class Contact
 	 */
 	public static function getPhoto(array $contact, string $avatar = '')
 	{
-		return self::getAvatarPath($contact, 'photo', DI::baseUrl() . '/images/person-300.jpg', Proxy::SIZE_SMALL, $avatar);
+		return self::getAvatarPath($contact, 'photo', DI::baseUrl() . self::DEFAULT_AVATAR_PHOTO, Proxy::SIZE_SMALL, $avatar);
 	}
 
 	/**
@@ -1479,7 +1483,7 @@ class Contact
 	 */
 	public static function getThumb(array $contact, string $avatar = '')
 	{
-		return self::getAvatarPath($contact, 'thumb', DI::baseUrl() . '/images/person-80.jpg', Proxy::SIZE_THUMB, $avatar);
+		return self::getAvatarPath($contact, 'thumb', DI::baseUrl() . self::DEFAULT_AVATAR_THUMB, Proxy::SIZE_THUMB, $avatar);
 	}
 
 	/**
@@ -1491,7 +1495,7 @@ class Contact
 	 */
 	public static function getMicro(array $contact, string $avatar = '')
 	{
-		return self::getAvatarPath($contact, 'micro', DI::baseUrl() . '/images/person-48.jpg', Proxy::SIZE_MICRO, $avatar);
+		return self::getAvatarPath($contact, 'micro', DI::baseUrl() . self::DEFAULT_AVATAR_MICRO, Proxy::SIZE_MICRO, $avatar);
 	}
 
 	/**
@@ -1530,13 +1534,13 @@ class Contact
 
 		/// add the default avatars if the fields aren't filled
 		if (isset($contact['photo']) && empty($contact['photo'])) {
-			$contact['photo'] = DI::baseUrl() . '/images/person-300.jpg';
+			$contact['photo'] = DI::baseUrl() . self::DEFAULT_AVATAR_PHOTO;
 		}
 		if (isset($contact['thumb']) && empty($contact['thumb'])) {
-			$contact['thumb'] = DI::baseUrl() . '/images/person-80.jpg';
+			$contact['thumb'] = DI::baseUrl() . self::DEFAULT_AVATAR_THUMB;
 		}
 		if (isset($contact['micro']) && empty($contact['micro'])) {
-			$contact['micro'] = DI::baseUrl() . '/images/person-48.jpg';
+			$contact['micro'] = DI::baseUrl() . self::DEFAULT_AVATAR_MICRO;
 		}
 
 		return $contact;
diff --git a/src/Model/Photo.php b/src/Model/Photo.php
index 7d984a8ce6..fecf6ffb7d 100644
--- a/src/Model/Photo.php
+++ b/src/Model/Photo.php
@@ -492,9 +492,9 @@ class Photo
 		}
 
 		if ($photo_failure) {
-			$image_url = DI::baseUrl() . "/images/person-300.jpg";
-			$thumb = DI::baseUrl() . "/images/person-80.jpg";
-			$micro = DI::baseUrl() . "/images/person-48.jpg";
+			$image_url = DI::baseUrl() . Contact::DEFAULT_AVATAR_PHOTO;
+			$thumb = DI::baseUrl() . Contact::DEFAULT_AVATAR_THUMB;
+			$micro = DI::baseUrl() . Contact::DEFAULT_AVATAR_MICRO;
 		}
 
 		return [$image_url, $thumb, $micro];
diff --git a/src/Module/Photo.php b/src/Module/Photo.php
index 826d86bdd5..0a0b6d3208 100644
--- a/src/Module/Photo.php
+++ b/src/Module/Photo.php
@@ -23,8 +23,8 @@ namespace Friendica\Module;
 
 use Friendica\BaseModule;
 use Friendica\Core\Logger;
-use Friendica\Core\System;
 use Friendica\DI;
+use Friendica\Model\Contact;
 use Friendica\Model\Photo as MPhoto;
 
 /**
@@ -139,16 +139,16 @@ class Photo extends BaseModule
 		case "profile":
 		case "custom":
 			$scale = 4;
-			$default = "images/person-300.jpg";
+			$default = Contact::DEFAULT_AVATAR_PHOTO;
 			break;
 		case "micro":
 			$scale = 6;
-			$default = "images/person-48.jpg";
+			$default = Contact::DEFAULT_AVATAR_MICRO;
 			break;
 		case "avatar":
 		default:
 			$scale = 5;
-			$default = "images/person-80.jpg";
+			$default = Contact::DEFAULT_AVATAR_THUMB;
 		}
 
 		$photo = MPhoto::selectFirst([], ["scale" => $scale, "uid" => $uid, "profile" => 1]);
diff --git a/src/Network/Probe.php b/src/Network/Probe.php
index 3524d00721..137f245755 100644
--- a/src/Network/Probe.php
+++ b/src/Network/Probe.php
@@ -29,6 +29,7 @@ use Friendica\Core\Protocol;
 use Friendica\Core\System;
 use Friendica\Database\DBA;
 use Friendica\DI;
+use Friendica\Model\Contact;
 use Friendica\Model\GServer;
 use Friendica\Model\Profile;
 use Friendica\Model\User;
@@ -369,7 +370,7 @@ class Probe
 		}
 
 		if (empty($data['photo'])) {
-			$data['photo'] = DI::baseUrl() . '/images/person-300.jpg';
+			$data['photo'] = DI::baseUrl() . Contact::DEFAULT_AVATAR_PHOTO;
 		}
 
 		if (empty($data['name'])) {
diff --git a/src/Util/Network.php b/src/Util/Network.php
index 7795b0cd29..6694fd4f0c 100644
--- a/src/Util/Network.php
+++ b/src/Util/Network.php
@@ -24,6 +24,7 @@ namespace Friendica\Util;
 use Friendica\Core\Hook;
 use Friendica\Core\Logger;
 use Friendica\DI;
+use Friendica\Model\Contact;
 
 class Network
 {
@@ -235,7 +236,7 @@ class Network
 		Hook::callAll('avatar_lookup', $avatar);
 
 		if (! $avatar['success']) {
-			$avatar['url'] = DI::baseUrl() . '/images/person-300.jpg';
+			$avatar['url'] = DI::baseUrl() . Contact::DEFAULT_AVATAR_PHOTO;
 		}
 
 		Logger::log('Avatar: ' . $avatar['email'] . ' ' . $avatar['url'], Logger::DEBUG);