diff --git a/include/cista/buffer.h b/include/cista/buffer.h
index b63702d2..4b26e527 100644
--- a/include/cista/buffer.h
+++ b/include/cista/buffer.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <cstdint>
 #include <cstdlib>
 #include <cstring>