diff --git a/ext/comment/main.php b/ext/comment/main.php
index 36196ede..f98ba3c7 100644
--- a/ext/comment/main.php
+++ b/ext/comment/main.php
@@ -451,7 +451,7 @@ class CommentList extends SimpleExtension {
 					"INSERT INTO comments(image_id, owner_id, owner_ip, posted, comment) ".
 					"VALUES(?, ?, ?, now(), ?)",
 					array($image_id, $user->id, $_SERVER['REMOTE_ADDR'], $comment));
-			$cid = $database->db->Insert_ID();
+			$cid = $database->db->lastInsertId();
 			log_info("comment", "Comment #$cid added to Image #$image_id");
 		}
 	}
diff --git a/ext/image/main.php b/ext/image/main.php
index 89da1730..5c4cad1d 100644
--- a/ext/image/main.php
+++ b/ext/image/main.php
@@ -243,7 +243,7 @@ class ImageIO extends SimpleExtension {
 			$image->id = $database->db->GetOne("SELECT id FROM images WHERE hash=?", array($image->hash));
 		}
 		else {
-			$image->id = $database->db->Insert_ID();
+			$image->id = $database->db->lastInsertId();
 		}
 
 		log_info("image", "Uploaded Image #{$image->id} ({$image->hash})");
diff --git a/ext/user/main.php b/ext/user/main.php
index 70912700..949d3609 100644
--- a/ext/user/main.php
+++ b/ext/user/main.php
@@ -304,7 +304,7 @@ class UserPage extends SimpleExtension {
 		$database->Execute(
 				"INSERT INTO users (name, pass, joindate, email, admin) VALUES (?, ?, now(), ?, ?)",
 				array($event->username, $hash, $email, $admin));
-		$uid = $database->db->Insert_ID();
+		$uid = $database->db->lastInsertId();
 		log_info("user", "Created User #$uid ({$event->username})");
 	}
 
diff --git a/install.php b/install.php
index 938d8493..c66f82c3 100644
--- a/install.php
+++ b/install.php
@@ -323,7 +323,7 @@ function insert_defaults($dsn) { // {{{
 		$user_insert = $db->Prepare("INSERT INTO users(name, pass, joindate, admin) VALUES(?, ?, now(), ?)");
 
 		$db->Execute($user_insert, Array('Anonymous', null, 'N'));
-		$db->Execute($config_insert, Array('anon_id', $db->Insert_ID()));
+		$db->Execute($config_insert, Array('anon_id', $db->lastInsertId()));
 
 		if(check_im_version() > 0) {
 			$db->Execute($config_insert, Array('thumb_engine', 'convert'));