diff --git a/wp-includes/post-formats.php b/wp-includes/post-formats.php
index e5340e66e1..6f5797989a 100644
--- a/wp-includes/post-formats.php
+++ b/wp-includes/post-formats.php
@@ -24,7 +24,7 @@ function get_post_format( $post = null ) {
 	$_format = get_the_terms( $post->ID, 'post_format' );
 
 	if ( empty( $_format ) )
-		return '';
+		return false;
 
 	$format = array_shift( $_format );