diff --git a/adminer/drivers/mongo.inc.php b/adminer/drivers/mongo.inc.php
index 0ab8f148..a3fc6200 100644
--- a/adminer/drivers/mongo.inc.php
+++ b/adminer/drivers/mongo.inc.php
@@ -58,7 +58,7 @@ if (isset($_GET["mongo"])) {
 						}
 					}
 				}
-				$this->num_rows = $result->count;
+				$this->num_rows = count($this->_rows);
 			}
 
 			function fetch_assoc() {