diff --git a/init/initramfs.c b/init/initramfs.c
index 80cd713..e44f2d9 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -515,6 +515,7 @@
 	initrd_end = 0;
 }
 
+#ifdef CONFIG_BLK_DEV_RAM
 #define BUF_SIZE 1024
 static void __init clean_rootfs(void)
 {
@@ -561,6 +562,7 @@
 	sys_close(fd);
 	kfree(buf);
 }
+#endif
 
 static int __init populate_rootfs(void)
 {