diff --git a/include/linux/compat.h b/include/linux/compat.h
index 41c9f6515f4621f6f20e90e0f5adbb4958829c58..7e05fcee75a158815986fe9477fbbf98bde50052 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -561,5 +561,9 @@ asmlinkage ssize_t compat_sys_process_vm_writev(compat_pid_t pid,
 		unsigned long liovcnt, const struct compat_iovec __user *rvec,
 		unsigned long riovcnt, unsigned long flags);
 
+#else
+
+#define is_compat_task() (0)
+
 #endif /* CONFIG_COMPAT */
 #endif /* _LINUX_COMPAT_H */