diff --git a/mercadopago/resources/preapproval.py b/mercadopago/resources/preapproval.py
index 603e5da..852ccdc 100644
--- a/mercadopago/resources/preapproval.py
+++ b/mercadopago/resources/preapproval.py
@@ -79,5 +79,5 @@ def update(self, preapproval_id, preapproval_object, request_options=None):
         if not isinstance(preapproval_object, dict):
             raise ValueError("Param preapproval_object must be a Dictionary")
 
-        return self._put(uri="/preapproval" + str(preapproval_id),
+        return self._put(uri="/preapproval/" + str(preapproval_id),
                          data=preapproval_object, request_options=request_options)