diff --git a/arch/ia64/include/asm/unistd.h b/arch/ia64/include/asm/unistd.h
index 61474f9156e7b54da5741c096fff9b35713d79d3..5a5347f5c4e489f6acf8214574b8e0cc1e6fbf4d 100644
--- a/arch/ia64/include/asm/unistd.h
+++ b/arch/ia64/include/asm/unistd.h
@@ -329,6 +329,7 @@
 #define __IGNORE_utime		/* utimes() */
 #define __IGNORE_getpgrp	/* getpgid() */
 #define __IGNORE_vfork		/* clone() */
+#define __IGNORE_umount2	/* umount() */
 
 #define __ARCH_WANT_SYS_RT_SIGACTION
 #define __ARCH_WANT_SYS_RT_SIGSUSPEND