diff --git a/wp-includes/query.php b/wp-includes/query.php
index 64fa8e3b82..205cd5f19d 100644
--- a/wp-includes/query.php
+++ b/wp-includes/query.php
@@ -1984,7 +1984,7 @@ class WP_Query {
 			}
 		}
 
-		if ( !empty($q['meta_key']) ) {
+		if ( !empty( $this->tax_query ) || !empty( $q['meta_key'] ) ) {
 			$groupby = "{$wpdb->posts}.ID";
 		}