diff --git a/flash.h b/flash.h
index 7491335..a28f0f3 100644
--- a/flash.h
+++ b/flash.h
@@ -417,7 +417,6 @@
 int probe_flash(struct registered_master *mst, int startchip, struct flashctx *fill_flash, int force);
 int read_flash_to_file(struct flashctx *flash, const char *filename);
 int verify_range(struct flashctx *flash, const uint8_t *cmpbuf, unsigned int start, unsigned int len);
-int need_erase(const uint8_t *have, const uint8_t *want, unsigned int len, enum write_granularity gran, const uint8_t erased_value);
 void print_version(void);
 void print_buildinfo(void);
 void print_banner(void);
diff --git a/flashrom.c b/flashrom.c
index caee351..1048164 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -463,8 +463,8 @@
  * @gran	write granularity (enum, not count)
  * @return      0 if no erase is needed, 1 otherwise
  */
-int need_erase(const uint8_t *have, const uint8_t *want, unsigned int len,
-               enum write_granularity gran, const uint8_t erased_value)
+static int need_erase(const uint8_t *have, const uint8_t *want, unsigned int len,
+		      enum write_granularity gran, const uint8_t erased_value)
 {
 	int result = 0;
 	unsigned int i;