diff --git a/src/wp-includes/class-wp-user-query.php b/src/wp-includes/class-wp-user-query.php
index 0c3e105..f5f4dc4 100644
--- a/src/wp-includes/class-wp-user-query.php
+++ b/src/wp-includes/class-wp-user-query.php
@@ -596,10 +596,17 @@ class WP_User_Query {
 
 		$this->request = "SELECT $this->query_fields $this->query_from $this->query_where $this->query_orderby $this->query_limit";
 
-		if ( is_array( $qv['fields'] ) || 'all' == $qv['fields'] ) {
-			$this->results = $wpdb->get_results( $this->request );
-		} else {
-			$this->results = $wpdb->get_col( $this->request );
+		$cache_key = 'user_query_' . md5( $this->request );
+		$this->results = wp_cache_get( $cache_key, 'users' );
+
+		if ( ! $this->results ) {
+			if ( is_array( $qv['fields'] ) || 'all' == $qv['fields'] ) {
+				$this->results = $wpdb->get_results( $this->request );
+			} else {
+				$this->results = $wpdb->get_col( $this->request );
+			}
+
+			wp_cache_add( $cache_key, $this->results, 'users' );
 		}
 
 		/**