diff --git a/libm/arch/i387/machine/npx.h b/libm/arch/i387/machine/npx.h
index 4427b106..c9de73a3 100644
--- a/libm/arch/i387/machine/npx.h
+++ b/libm/arch/i387/machine/npx.h
@@ -42,6 +42,8 @@
 #ifndef	_I386_NPX_H_
 #define	_I386_NPX_H_
 
+#include <__/stdint.h>
+
 /* Environment information of floating point unit */
 struct env87 {
 	long	 en_cw;		/* control word (16bits) */