diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index 3435ca3..57f70bc 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -268,7 +268,9 @@
 struct proc_maps_private {
 	struct pid *pid;
 	struct task_struct *task;
+#ifdef CONFIG_MMU
 	struct vm_area_struct *tail_vma;
+#endif
 };
 
 #endif /* _LINUX_PROC_FS_H */