diff --git a/libc/arch-x86_64/include/machine/endian.h b/libc/arch-x86_64/include/machine/endian.h
index 7889a37..8a3b0c5 100644
--- a/libc/arch-x86_64/include/machine/endian.h
+++ b/libc/arch-x86_64/include/machine/endian.h
@@ -56,6 +56,7 @@
 #endif	/* __GNUC__ */
 
 #define _BYTE_ORDER _LITTLE_ENDIAN
+#include <sys/types.h>
 #include <sys/endian.h>
 
 #endif /* _MACHINE_ENDIAN_H_ */