diff --git a/src/aarch64_fpmath.h b/src/aarch64_fpmath.h
index c95ea9b..e1fdc63 100644
--- a/src/aarch64_fpmath.h
+++ b/src/aarch64_fpmath.h
@@ -27,6 +27,8 @@
  * $FreeBSD: head/lib/libc/aarch64/_fpmath.h 281197 2015-04-07 09:52:14Z andrew $
  */
 
+#include <stdint.h>
+
 union IEEEl2bits {
 	long double	e;
 	struct {