diff --git a/include/chipdrivers.h b/include/chipdrivers.h
index 31afc84..8e2c520 100644
--- a/include/chipdrivers.h
+++ b/include/chipdrivers.h
@@ -61,6 +61,7 @@
 int spi_enter_4ba(struct flashctx *flash);
 int spi_exit_4ba(struct flashctx *flash);
 int spi_set_extended_address(struct flashctx *, uint8_t addr_high);
+int spi_prepare_4ba(struct flashctx *, enum preparation_steps);
 
 
 /* spi25_statusreg.c */