diff --git a/cache.h b/cache.h
index 4148b6322d..703a474e5a 100644
--- a/cache.h
+++ b/cache.h
@@ -1588,8 +1588,6 @@ struct date_mode *date_mode_from_type(enum date_mode_type type);
 
 const char *show_date(timestamp_t time, int timezone, const struct date_mode *mode);
 void show_date_relative(timestamp_t time, struct strbuf *timebuf);
-void show_date_human(timestamp_t time, int tz, const struct timeval *now,
-			struct strbuf *timebuf);
 int parse_date(const char *date, struct strbuf *out);
 int parse_date_basic(const char *date, timestamp_t *timestamp, int *offset);
 int parse_expiry_date(const char *date, timestamp_t *timestamp);