Index: wp-includes/user.php
===================================================================
--- wp-includes/user.php	(revision 18084)
+++ wp-includes/user.php	(working copy)
@@ -360,6 +360,7 @@
 	var $query_where;
 	var $query_orderby;
 	var $query_limit;
+	var $query_groupby = '';
 
 
 	/**
@@ -517,6 +518,7 @@
 			$clauses = $meta_query->get_sql( 'user', $wpdb->users, 'ID', $this );
 			$this->query_from .= $clauses['join'];
 			$this->query_where .= $clauses['where'];
+			$this->query_groupby = 'group by ID';
 		}
 
 		if ( !empty( $qv['include'] ) ) {
@@ -540,13 +542,13 @@
 		global $wpdb;
 
 		if ( is_array( $this->query_vars['fields'] ) || 'all' == $this->query_vars['fields'] ) {
-			$this->results = $wpdb->get_results("SELECT $this->query_fields $this->query_from $this->query_where $this->query_orderby $this->query_limit");
+			$this->results = $wpdb->get_results("SELECT $this->query_fields $this->query_from $this->query_where $this->query_groupby $this->query_orderby $this->query_limit");
 		} else {
-			$this->results = $wpdb->get_col("SELECT $this->query_fields $this->query_from $this->query_where $this->query_orderby $this->query_limit");
+			$this->results = $wpdb->get_col("SELECT $this->query_fields $this->query_from $this->query_where $this->query_groupby $this->query_orderby $this->query_limit");
 		}
 
 		if ( $this->query_vars['count_total'] )
-			$this->total_users = $wpdb->get_var("SELECT COUNT(*) $this->query_from $this->query_where");
+			$this->total_users = $wpdb->get_var("SELECT COUNT(DISTINCT ID) $this->query_from $this->query_where");
 
 		if ( !$this->results )
 			return;