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-rw-r--r--lib/prefix.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/prefix.h b/lib/prefix.h
index d3c387e102..d57b43dac6 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -466,7 +466,7 @@ extern int is_zero_mac(struct ethaddr *mac);
extern int prefix_str2mac(const char *str, struct ethaddr *mac);
extern char *prefix_mac2str(const struct ethaddr *mac, char *buf, int size);
-extern unsigned prefix_hash_key(void *pp);
+extern unsigned prefix_hash_key(const void *pp);
extern int str_to_esi(const char *str, esi_t *esi);
extern char *esi_to_str(const esi_t *esi, char *buf, int size);