diff --git a/lib/aes.h b/lib/aes.h
index 293f3665..0ea713bc 100644
--- a/lib/aes.h
+++ b/lib/aes.h
@@ -21,6 +21,9 @@
 #ifdef HAVE_CONFIG_H
 #include "config.h"
 #endif
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#endif
 
 #include "compat.h"