diff --git a/functions b/functions
index f4dc5ff..228bb2d 100644
--- a/functions
+++ b/functions
@@ -10,7 +10,7 @@ get_stack () {
 generate_private_key () {
   test -f "$private_key" && return 1
 
-  ssh-keygen -t ecdsa -f "$private_key" -N "" -m PEM
+  ssh-keygen -t ecdsa -f "$private_key" -N ""
 }
 
 # Firmar el archivo usando la llave privada.