diff --git a/common/exception.hpp b/common/exception.hpp
index 4d002d5..afab018 100644
--- a/common/exception.hpp
+++ b/common/exception.hpp
@@ -3,6 +3,7 @@
 #include <string>
 #include <vector>
 #include <utility>
+#include <cstdint>
 
 namespace nkg {