diff --git a/rtengine/alignedbuffer.h b/rtengine/alignedbuffer.h
index 560f0884f..27a376c57 100644
--- a/rtengine/alignedbuffer.h
+++ b/rtengine/alignedbuffer.h
@@ -18,6 +18,8 @@
  */
 #ifndef _ALIGNEDBUFFER_
 #define _ALIGNEDBUFFER_
+
+#include <cstdint>
 #include <cstdlib>
 #include <utility>