diff --git a/src/Application.vala b/src/Application.vala
index 7ab6de7..17c2575 100644
--- a/src/Application.vala
+++ b/src/Application.vala
@@ -5,7 +5,7 @@
 
 public class Application : Gtk.Application {
     public static bool keep_open = false;
-    public static string text = "";
+    public static string? text = null;
 
     private OptionEntry[] options = {
         {
diff --git a/src/MainWindow.vala b/src/MainWindow.vala
index 7e22855..3869855 100644
--- a/src/MainWindow.vala
+++ b/src/MainWindow.vala
@@ -92,7 +92,7 @@ public class MainWindow : Gtk.ApplicationWindow {
     private async void update_result_label () {
         is_label_updated = true;
 
-        if (Application.text != "") {
+        if (Application.text != null) {
             // Set the text passed by the command line option if specified
             result_label.label = Application.text;
         } else {