diff --git a/coreutils/cp.c b/coreutils/cp.c
index 428eaee..c863630 100644
--- a/coreutils/cp.c
+++ b/coreutils/cp.c
@@ -23,7 +23,7 @@ char *make_path(const char *src, const char *dst) {
 
 int write_buffer(int ifd, int ofd) {
 	off_t len = lseek(ifd, 0, SEEK_END);
-	if (len <= 0)
+	if (len < 0)
 		return 1;
 
 	if (ftruncate(ofd, len) < 0)
@@ -143,7 +143,7 @@ int main(const int argc, const char **argv) {
 			if (new_path == NULL)
 				return 1;
 
-			if (copy(argv[i], new_path))
+			if (cptree(argv[i], new_path))
 				ret = 1;
 
 			free(new_path);