diff --git a/armsrc/em4x50.h b/armsrc/em4x50.h
index 746ca4811..aecaea78e 100644
--- a/armsrc/em4x50.h
+++ b/armsrc/em4x50.h
@@ -20,5 +20,6 @@ typedef struct {
 void em4x50_info(em4x50_data_t *etd);
 void em4x50_write(em4x50_data_t *etd);
 void em4x50_write_password(em4x50_data_t *etd);
+void em4x50_sread(em4x50_data_t *etd);
 
 #endif /* EM4X50_H */