diff --git a/line-log.c b/line-log.c
index b7864ad586..a490efea07 100644
--- a/line-log.c
+++ b/line-log.c
@@ -237,7 +237,7 @@ static void diff_ranges_release(struct diff_ranges *diff)
 	range_set_release(&diff->target);
 }
 
-void line_log_data_init(struct line_log_data *r)
+static void line_log_data_init(struct line_log_data *r)
 {
 	memset(r, 0, sizeof(struct line_log_data));
 	range_set_init(&r->ranges, 0);
diff --git a/line-log.h b/line-log.h
index a9212d84e4..7a5c24e2df 100644
--- a/line-log.h
+++ b/line-log.h
@@ -54,8 +54,6 @@ struct line_log_data {
 	struct diff_ranges diff;
 };
 
-extern void line_log_data_init(struct line_log_data *r);
-
 extern void line_log_init(struct rev_info *rev, const char *prefix, struct string_list *args);
 
 extern int line_log_filter(struct rev_info *rev);