diff --git a/Arduino/UUGear/UUGear.ino b/Arduino/UUGear/UUGear.ino
index 7ca4dad..13daf3d 100644
--- a/Arduino/UUGear/UUGear.ino
+++ b/Arduino/UUGear/UUGear.ino
@@ -84,7 +84,7 @@ void(* resetDevice) (void) = 0;
 
 void setup() {
   // if has no id yet, generate one
-  if (getID() == "") {
+  if (getID().startsWith(ID_PREFIX) == false) {
     generateID();
   }