diff --git a/drivers/pipes/pipe_common.c b/drivers/pipes/pipe_common.c
index d68896dd1f..dbc90d2ff2 100644
--- a/drivers/pipes/pipe_common.c
+++ b/drivers/pipes/pipe_common.c
@@ -877,6 +877,10 @@ int pipecommon_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
         }
         break;
 
+      case BIOC_FLUSH:
+        ret = -EINVAL;
+        break;
+
       default:
         ret = -ENOTTY;
         break;
diff --git a/net/local/local_sockif.c b/net/local/local_sockif.c
index fa556734ad..ff6fd18c9e 100644
--- a/net/local/local_sockif.c
+++ b/net/local/local_sockif.c
@@ -847,6 +847,9 @@ static int local_ioctl(FAR struct socket *psock, int cmd, unsigned long arg)
             ret = -ENOTCONN;
           }
         break;
+      case BIOC_FLUSH:
+        ret = -EINVAL;
+        break;
       default:
         ret = -ENOTTY;
         break;