diff --git a/core/io/file_access_pack.h b/core/io/file_access_pack.h
index 3c84e6b656f..343adbe5924 100644
--- a/core/io/file_access_pack.h
+++ b/core/io/file_access_pack.h
@@ -92,7 +92,7 @@ private:
 
 		PathMD5() {}
 
-		PathMD5(const Vector<uint8_t> p_buf) {
+		PathMD5(const Vector<uint8_t> &p_buf) {
 			a = *((uint64_t *)&p_buf[0]);
 			b = *((uint64_t *)&p_buf[8]);
 		}