diff --git a/fs/proc/base.c b/fs/proc/base.c
index efb304854b74..1a8d756021f2 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -891,6 +891,10 @@ static ssize_t mem_read(struct file * file, char __user * buf,
 	return ret;
 }
 
+#define mem_write NULL
+
+#ifndef mem_write
+/* This is a security hazard */
 static ssize_t mem_write(struct file * file, const char __user *buf,
 			 size_t count, loff_t *ppos)
 {
@@ -949,6 +953,7 @@ static ssize_t mem_write(struct file * file, const char __user *buf,
 out_no_task:
 	return copied;
 }
+#endif
 
 loff_t mem_lseek(struct file *file, loff_t offset, int orig)
 {