diff --git a/include/misc/Random.h b/include/misc/Random.h
index d829b47..057fcad 100644
--- a/include/misc/Random.h
+++ b/include/misc/Random.h
@@ -6,7 +6,7 @@ namespace td {
 namespace utils {
 
 void initRandomizer();
-std::uint64_t getRandomNumber(std::size_t max);
+std::uint64_t getRandomNumber(std::uint64_t max);
 
 } // namespace utils
 } // namespace td