diff --git a/drivers/note/noteram_driver.c b/drivers/note/noteram_driver.c
index 0cca512e41e..d19a4cb454c 100644
--- a/drivers/note/noteram_driver.c
+++ b/drivers/note/noteram_driver.c
@@ -604,6 +604,18 @@ static int noteram_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
           }
         break;
 
+      case FIONREAD:
+        if (arg == 0)
+          {
+            ret = -EINVAL;
+          }
+        else
+          {
+            *(FAR unsigned int *)arg = noteram_unread_length(drv);
+            ret = OK;
+          }
+        break;
+
       default:
           break;
     }