diff --git a/src/include/fork.h b/src/include/fork.h
index bd85b56..204c869 100644
--- a/src/include/fork.h
+++ b/src/include/fork.h
@@ -1,18 +1,19 @@
 #ifndef FORK_H
 #define FORK_H
 #include <string>
+#include <cstdint>
 
 #ifndef CXXBRIDGE1_ENUM_Fork
 #define CXXBRIDGE1_ENUM_Fork
 enum class Fork: std::uint8_t {
     Parent,
     Child
 };
 #endif
 
 using Callback = void(*)();
 pid_t set_sid();
 void close_fd();
 Fork fork_process();
 extern "C" int32_t try_fork(bool nochdir, bool noclose, Callback callback);
 #endif