diff --git a/include/safetyhook/utility.hpp b/include/safetyhook/utility.hpp
index 06ae1c0..90d710e 100644
--- a/include/safetyhook/utility.hpp
+++ b/include/safetyhook/utility.hpp
@@ -2,6 +2,7 @@
 
 #include <algorithm>
 #include <cstdint>
+#include <optional>
 #include <type_traits>
 
 namespace safetyhook {