diff --git a/src/main.rs b/src/main.rs
index f0bd82c..b9ca37a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -31,7 +31,7 @@ fn include_app_css() {
   // to relay color scheme changes to it.
 
   let provider = CssProvider::new();
-  let display = Display::default().unwrap();
+  let display = Display::default().expect("getting the default GDK4 display should never fail");
 
   provider.load_from_string(include_str!("application.css"));
   style_context_add_provider_for_display(&display, &provider, STYLE_PROVIDER_PRIORITY_APPLICATION);