diff --git a/flash.h b/flash.h
index 753b46e..0fa3129 100644
--- a/flash.h
+++ b/flash.h
@@ -416,7 +416,6 @@
 int erase_flash(struct flashctx *flash);
 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);
-char *extract_param(const char *const *haystack, const char *needle, const char *delim);
 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);
diff --git a/flashrom.c b/flashrom.c
index ae471da..2837b0d 100644
--- a/flashrom.c
+++ b/flashrom.c
@@ -278,7 +278,7 @@
  * needle and remove everything from the first occurrence of needle to the next
  * delimiter from haystack.
  */
-char *extract_param(const char *const *haystack, const char *needle, const char *delim)
+static char *extract_param(const char *const *haystack, const char *needle, const char *delim)
 {
 	char *param_pos, *opt_pos, *rest;
 	char *opt = NULL;