diff --git a/chipdrivers.h b/chipdrivers.h
index 9e2b44b..e5f426c 100644
--- a/chipdrivers.h
+++ b/chipdrivers.h
@@ -208,4 +208,7 @@
 int probe_spi_st95(struct flashctx *flash);
 int spi_block_erase_emulation(struct flashctx *flash, unsigned int addr, unsigned int blocklen);
 
+/* writeprotect_ranges.c */
+void decode_range_spi25(size_t *start, size_t *len, const struct wp_bits *, size_t chip_len);
+
 #endif /* !__CHIPDRIVERS_H__ */