diff --git a/include/treelite/model_loader.h b/include/treelite/model_loader.h
index c8a87afa..f58cb188 100644
--- a/include/treelite/model_loader.h
+++ b/include/treelite/model_loader.h
@@ -8,6 +8,7 @@
 #define TREELITE_MODEL_LOADER_H_
 
 #include <cstddef>
+#include <cstdint>
 #include <memory>
 #include <string>
 #include <string_view>