Index: wp-includes/wp-db.php
===================================================================
--- wp-includes/wp-db.php	(revision 12726)
+++ wp-includes/wp-db.php	(working copy)
@@ -370,14 +370,14 @@
 		if ( WP_DEBUG )
 			$this->show_errors();
 
-                if( is_multisite() ) {
-                        $this->charset = 'utf8';
-                        if( defined( 'DB_COLLATE' ) && constant( 'DB_COLLATE' ) != '' ) {
-                                $this->collate = constant( 'DB_COLLATE' );
-                        } else {
-                                $this->collate = 'utf8_general_ci';
-                        }
-                }
+		if( function_exists( 'is_multiside' ) && is_multisite() ) {
+				$this->charset = 'utf8';
+				if( defined( 'DB_COLLATE' ) && constant( 'DB_COLLATE' ) != '' ) {
+						$this->collate = constant( 'DB_COLLATE' );
+				} else {
+						$this->collate = 'utf8_general_ci';
+				}
+		}
 
 		if ( defined('DB_CHARSET') )
 			$this->charset = DB_CHARSET;