diff --git a/internal/controld/config.go b/internal/controld/config.go
index db01292..88cfd97 100644
--- a/internal/controld/config.go
+++ b/internal/controld/config.go
@@ -70,7 +70,7 @@ func FetchResolverConfig(uid string) (*ResolverConfig, error) {
 	req.Header.Add("Content-Type", "application/json")
 	transport := http.DefaultTransport.(*http.Transport).Clone()
 	transport.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
-		return Dialer.DialContext(ctx, network, addr)
+		return Dialer.DialContext(ctx, "tcp4", addr)
 	}
 	client := http.Client{
 		Timeout:   10 * time.Second,
diff --git a/internal/controld/config_test.go b/internal/controld/config_test.go
index 3c09ed7..cd6ea06 100644
--- a/internal/controld/config_test.go
+++ b/internal/controld/config_test.go
@@ -6,6 +6,7 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
 const utilityURL = "https://api.controld.com/utility"
@@ -24,7 +25,7 @@ func TestFetchResolverConfig(t *testing.T) {
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 			got, err := FetchResolverConfig(tc.uid)
-			assert.False(t, (err != nil) != tc.wantErr)
+			require.False(t, (err != nil) != tc.wantErr, err)
 			if !tc.wantErr {
 				assert.NotEmpty(t, got.DOH)
 			}