diff --git a/wp-includes/meta.php b/wp-includes/meta.php
index 8833d3e987..a252bc9abb 100644
--- a/wp-includes/meta.php
+++ b/wp-includes/meta.php
@@ -364,12 +364,11 @@ function delete_metadata($meta_type, $object_id, $meta_key, $meta_value = '', $d
 		return false;
 
 	if ( $delete_all ) {
-		$value_clause = '';
 		if ( '' !== $meta_value && null !== $meta_value && false !== $meta_value ) {
-			$value_clause = $wpdb->prepare( " AND meta_value = %s", $meta_value );
+			$object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s AND meta_value = %s", $meta_key, $meta_value ) );
+		} else {
+			$object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s", $meta_key ) );
 		}
-
-		$object_ids = $wpdb->get_col( $wpdb->prepare( "SELECT $type_column FROM $table WHERE meta_key = %s $value_clause", $meta_key ) );
 	}
 
 	/**