diff --git a/include/em4x50.h b/include/em4x50.h
index b70072c32..240a4c41c 100644
--- a/include/em4x50.h
+++ b/include/em4x50.h
@@ -49,6 +49,8 @@ typedef struct {
     uint8_t addresses[4];
     uint8_t address;
     uint8_t word[4];
+    uint32_t start_password;
+    uint32_t stop_password;
 } em4x50_data_t;
 
 typedef struct {