diff --git a/line-log.c b/line-log.c
index 951029665..cb0dc1110 100644
--- a/line-log.c
+++ b/line-log.c
@@ -43,7 +43,7 @@ void range_set_release(struct range_set *rs)
 static void range_set_copy(struct range_set *dst, struct range_set *src)
 {
 	range_set_init(dst, src->nr);
-	memcpy(dst->ranges, src->ranges, src->nr*sizeof(struct range_set));
+	memcpy(dst->ranges, src->ranges, src->nr*sizeof(struct range));
 	dst->nr = src->nr;
 }
 static void range_set_move(struct range_set *dst, struct range_set *src)