diff --git a/drivers/power/relay/relay.c b/drivers/power/relay/relay.c
index ccf42eb055..0179df82e9 100644
--- a/drivers/power/relay/relay.c
+++ b/drivers/power/relay/relay.c
@@ -116,7 +116,7 @@ static int relay_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
           }
         else
           {
-            ret = -ENOTSUP;
+            ret = -ENOTTY;
           }
         break;
     }