diff --git a/portfolio/googledocs/lib.php b/portfolio/googledocs/lib.php
index 8201836a7e3..2a23e6ce539 100644
--- a/portfolio/googledocs/lib.php
+++ b/portfolio/googledocs/lib.php
@@ -93,6 +93,9 @@ class portfolio_plugin_googledocs extends portfolio_plugin_push_base {
         google_docs::set_sesskey($this->sessiontoken, $this->get('user')->id);
     }
 
+    public static function allows_multiple_instances() {
+        return false;
+    }
 }
 
 /**
diff --git a/portfolio/picasa/lib.php b/portfolio/picasa/lib.php
index 0632a7a0ee8..f0fab4af87a 100644
--- a/portfolio/picasa/lib.php
+++ b/portfolio/picasa/lib.php
@@ -86,6 +86,9 @@ class portfolio_plugin_picasa extends portfolio_plugin_push_base {
         google_picasa::set_sesskey($this->sessionkey, $this->get('user')->id);
     }
 
+    public static function allows_multiple_instances() {
+        return false;
+    }
 }
 
 /**