diff --git a/fs/proc/base.c b/fs/proc/base.c
index e34c3c33b2de5e948461d4f76360d619de39e938..bc15df390ec49c47be7ac4b0ae1030d806b1db90 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -854,10 +854,6 @@ 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)
 {
@@ -914,7 +910,6 @@ 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)
 {