diff --git a/include/nuttx/drivers/ramdisk.h b/include/nuttx/drivers/ramdisk.h
index 9706a4f625..63848be1b5 100644
--- a/include/nuttx/drivers/ramdisk.h
+++ b/include/nuttx/drivers/ramdisk.h
@@ -92,14 +92,9 @@ extern "C"
  *
  ****************************************************************************/
 
-#ifdef CONFIG_FS_WRITABLE
 int ramdisk_register(int minor, FAR uint8_t *buffer, uint32_t nsectors,
                      uint16_t sectsize, uint8_t rdflags);
 #define romdisk_register(m,b,n,s) ramdisk_register(m,(FAR uint8_t *)b,n,s,0)
-#else
-int romdisk_register(int minor, FAR const uint8_t *buffer, uint32_t nsectors,
-                     uint16_t sectsize);
-#endif
 
 /****************************************************************************
  * Name: mkrd