diff --git a/rerun_cpp/src/rerun/component_descriptor.hpp b/rerun_cpp/src/rerun/component_descriptor.hpp
index b9c14e30b3f3..a80ae720612c 100644
--- a/rerun_cpp/src/rerun/component_descriptor.hpp
+++ b/rerun_cpp/src/rerun/component_descriptor.hpp
@@ -2,6 +2,7 @@
 
 #include <optional>
 #include <string_view>
+#include <cstdint>
 
 namespace rerun {
     /// See `ComponentDescriptor::hashed`.