diff --git a/include/chipdrivers/memory_bus.h b/include/chipdrivers/memory_bus.h
index 758fa64..2a5e080 100644
--- a/include/chipdrivers/memory_bus.h
+++ b/include/chipdrivers/memory_bus.h
@@ -90,6 +90,10 @@
 int write_en29lv640b(struct flashprog_flashctx *, const uint8_t *buf, unsigned int start, unsigned int len);
 
 /* memory_bus.c */
+struct par_master;
+void *programmer_map_flash_data(const struct par_master *, chipsize_t, const char *descr);
+void programmer_unmap_flash_region(const struct par_master *, void *, chipsize_t);
+
 enum preparation_steps;
 int prepare_memory_access(struct flashprog_flashctx *, enum preparation_steps);
 int prepare_memory_register_access(struct flashprog_flashctx *, enum preparation_steps);