diff --git a/packages/block-library/src/post-title/block.json b/packages/block-library/src/post-title/block.json
index d17ad5cc0e93a..2fd03ef784a84 100644
--- a/packages/block-library/src/post-title/block.json
+++ b/packages/block-library/src/post-title/block.json
@@ -50,6 +50,7 @@
 			"__experimentalFontFamily": true,
 			"__experimentalFontWeight": true,
 			"__experimentalFontStyle": true,
+			"__experimentalTextDecoration": true,
 			"__experimentalTextTransform": true,
 			"__experimentalLetterSpacing": true,
 			"__experimentalDefaultControls": {
diff --git a/packages/block-library/src/post-title/index.php b/packages/block-library/src/post-title/index.php
index 78f1e859fbffa..a881f9e1f10f9 100644
--- a/packages/block-library/src/post-title/index.php
+++ b/packages/block-library/src/post-title/index.php
@@ -33,10 +33,19 @@ function render_block_core_post_title( $attributes, $content, $block ) {
 		$tag_name = 0 === $attributes['level'] ? 'p' : 'h' . $attributes['level'];
 	}
 
+	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $align_class_name ) );
+
 	if ( isset( $attributes['isLink'] ) && $attributes['isLink'] ) {
-		$title = sprintf( '<a href="%1$s" target="%2$s" rel="%3$s">%4$s</a>', get_the_permalink( $post_ID ), esc_attr( $attributes['linkTarget'] ), esc_attr( $attributes['rel'] ), $title );
+		return sprintf(
+			'<%1$s><a href="%2$s" target="%3$s" rel="%4$s" %5$s>%6$s</a></%1$s>',
+			$tag_name,
+			get_the_permalink( $post_ID ),
+			esc_attr( $attributes['linkTarget'] ),
+			esc_attr( $attributes['rel'] ),
+			$wrapper_attributes,
+			$title
+		);
 	}
-	$wrapper_attributes = get_block_wrapper_attributes( array( 'class' => $align_class_name ) );
 
 	return sprintf(
 		'<%1$s %2$s>%3$s</%1$s>',