build: Use stdint
diff --git a/include/md2.h b/include/md2.h
index 02a64fb..7832905 100644
--- a/include/md2.h
+++ b/include/md2.h
@@ -6,6 +6,8 @@
#include <sys/cdefs.h>
#include <sys/types.h>
+#include <stdint.h>
+
#define MD2_DIGEST_LENGTH 16
#define MD2_DIGEST_STRING_LENGTH 33