diff --git a/plugins/libimhex/include/hex/helpers/concepts.hpp b/plugins/libimhex/include/hex/helpers/concepts.hpp
index f756e3c6b..e74a8dfb1 100644
--- a/plugins/libimhex/include/hex/helpers/concepts.hpp
+++ b/plugins/libimhex/include/hex/helpers/concepts.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstddef>
 #include <type_traits>
 
 namespace hex {