diff --git a/io_test.go b/io_test.go
index 4f3d8a8..2d88a50 100644
--- a/io_test.go
+++ b/io_test.go
@@ -9,6 +9,7 @@ import (
 	"os"
 	"runtime"
 	"sync"
+	"syscall"
 	"testing"
 	"time"
 )
@@ -28,9 +29,10 @@ var glTestFdLock sync.Mutex
 //
 //nolint:paralleltest // Potential in (*os.File).Fd().
 func TestReadDeadline(t *testing.T) {
-	t.Skip("Disabling while investigating race.")
-
 	ptmx, success := prepare(t)
+	if err := syscall.SetNonblock(int(ptmx.Fd()), true); err != nil {
+		t.Fatalf("Error: set non block: %s", err)
+	}
 
 	if err := ptmx.SetDeadline(time.Now().Add(timeout / 10)); err != nil {
 		if errors.Is(err, os.ErrNoDeadline) {
@@ -59,9 +61,10 @@ func TestReadDeadline(t *testing.T) {
 //
 //nolint:paralleltest // Potential in (*os.File).Fd().
 func TestReadClose(t *testing.T) {
-	t.Skip("Disabling while investigating race.")
-
 	ptmx, success := prepare(t)
+	if err := syscall.SetNonblock(int(ptmx.Fd()), true); err != nil {
+		t.Fatalf("Error: set non block: %s", err)
+	}
 
 	go func() {
 		time.Sleep(timeout / 10)