diff --git a/include/asm-sh/unistd.h b/include/asm-sh/unistd.h
index 17f527bfd455ec72fa369e056f32652138e9a1fb..49be50a36b77dc3dc02dad61892100051f030377 100644
--- a/include/asm-sh/unistd.h
+++ b/include/asm-sh/unistd.h
@@ -233,6 +233,7 @@
 #define __NR_fcntl64		221
 /* 223 is unused */
 #define __NR_gettid		224
+#define __NR_readahead		225
 #define __NR_setxattr		226
 #define __NR_lsetxattr		227
 #define __NR_fsetxattr		228