diff --git a/include/asm-mips/fcntl.h b/include/asm-mips/fcntl.h
index 00a50ec1c19f..2a52333a062d 100644
--- a/include/asm-mips/fcntl.h
+++ b/include/asm-mips/fcntl.h
@@ -13,6 +13,7 @@
 #define O_SYNC		0x0010
 #define O_NONBLOCK	0x0080
 #define O_CREAT         0x0100	/* not fcntl */
+#define O_TRUNC		0x0200	/* not fcntl */
 #define O_EXCL		0x0400	/* not fcntl */
 #define O_NOCTTY	0x0800	/* not fcntl */
 #define FASYNC		0x1000	/* fcntl, for BSD compatibility */