diff --git a/internal/config/config_test.go b/internal/config/config_test.go
index d977312..1730669 100644
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -260,7 +260,7 @@ func TestCarrierBatchMustFitDesktopLoopbackCap(t *testing.T) {
 	}
 	write := func(batch, body int) string {
 		path := filepath.Join(directory, "config.json")
-		content := `{"public_hostname":"proxy.example.com","public_dir":"` + directory + `","profiles_file":"` + profiles + `","limits":{"carrier_batch_bytes":` + strconv.Itoa(batch) + `,"max_body_bytes":` + strconv.Itoa(body) + `}}`
+		content := `{"public_hostname":"proxy.example.com","public_dir":` + strconv.Quote(directory) + `,"profiles_file":` + strconv.Quote(profiles) + `,"limits":{"carrier_batch_bytes":` + strconv.Itoa(batch) + `,"max_body_bytes":` + strconv.Itoa(body) + `}}`
 		if err := os.WriteFile(path, []byte(content), 0600); err != nil {
 			t.Fatal(err)
 		}