diff --git a/includes/class-mention.php b/includes/class-mention.php
index e0930cc..9c93d80 100644
--- a/includes/class-mention.php
+++ b/includes/class-mention.php
@@ -46,6 +46,12 @@ class Mention {
 			$the_content
 		);
 
+		$the_content = preg_replace_callback(
+			'#<img.*?[^>]+>#i',
+			$protect,
+			$the_content
+		);
+
 		$the_content = \preg_replace_callback( '/@' . ACTIVITYPUB_USERNAME_REGEXP . '/', array( self::class, 'replace_with_links' ), $the_content );
 
 		$the_content = str_replace( array_reverse( array_keys( $protected_tags ) ), array_reverse( array_values( $protected_tags ) ), $the_content );
diff --git a/tests/test-class-activitypub-mention.php b/tests/test-class-activitypub-mention.php
index 6f6b9ff..ca7395f 100644
--- a/tests/test-class-activitypub-mention.php
+++ b/tests/test-class-activitypub-mention.php
@@ -31,6 +31,7 @@ ENDPRE;
 			array( 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/author/matthias-pfefferle/">@<span>pfefferle</span>@notiz.blog</a> test', 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/author/matthias-pfefferle/">@<span>pfefferle</span>@notiz.blog</a> test' ),
 			array( 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/author/matthias-pfefferle/">@pfefferle@notiz.blog</a> test', 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/author/matthias-pfefferle/">@pfefferle@notiz.blog</a> test' ),
 			array( 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/@pfefferle/">@pfefferle@notiz.blog</a> test', 'hallo <a rel="mention" class="u-url mention" href="https://notiz.blog/@pfefferle/">@pfefferle@notiz.blog</a> test' ),
+			array( 'hallo <img src="abc" alt="https://notiz.blog/@pfefferle/" title="@pfefferle@notiz.blog"/> test', 'hallo <img src="abc" alt="https://notiz.blog/@pfefferle/" title="@pfefferle@notiz.blog"/> test' ),
 			array( $code, $code ),
 			array( $pre, $pre ),
 		);