diff --git a/chrome/content/zotero/preferences/preferences_advanced.js b/chrome/content/zotero/preferences/preferences_advanced.js
index 5c1a42414d..9d466dae5a 100644
--- a/chrome/content/zotero/preferences/preferences_advanced.js
+++ b/chrome/content/zotero/preferences/preferences_advanced.js
@@ -335,7 +335,7 @@ Zotero_Preferences.Attachment_Base_Directory = {
 			return false;
 		}
 		
-		return changePath(newPath);
+		return this.changePath(newPath);
 	}),