diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 7452b695fdae..f68673a91756 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -3201,7 +3201,7 @@ static long do_pagemap_cmd(struct file *file, unsigned int cmd,
 		return do_pagemap_scan(mm, arg);
 
 	default:
-		return -EINVAL;
+		return -ENOIOCTLCMD;
 	}
 }