diff --git a/book/listings/gobject_properties/4/custom_button/imp.rs b/book/listings/gobject_properties/4/custom_button/imp.rs
index 31bc01d4fa3b..af5e26785faf 100644
--- a/book/listings/gobject_properties/4/custom_button/imp.rs
+++ b/book/listings/gobject_properties/4/custom_button/imp.rs
@@ -80,7 +80,7 @@ impl WidgetImpl for CustomButton {}
 // Trait shared by all buttons
 impl ButtonImpl for CustomButton {
     fn clicked(&self, button: &Self::Type) {
-        let incremented_number = self.number.borrow().clone() + 1;
+        let incremented_number = *self.number.borrow() + 1;
         button.set_property("number", &incremented_number).unwrap();
         button.set_label(&self.number.borrow().to_string())
     }
diff --git a/book/listings/gobject_properties/4/custom_button/mod.rs b/book/listings/gobject_properties/4/custom_button/mod.rs
index 5a0569ae4a16..876e81d6839f 100644
--- a/book/listings/gobject_properties/4/custom_button/mod.rs
+++ b/book/listings/gobject_properties/4/custom_button/mod.rs
@@ -13,3 +13,9 @@ impl CustomButton {
         Object::new(&[]).expect("Failed to create Button")
     }
 }
+
+impl Default for CustomButton {
+    fn default() -> Self {
+        CustomButton::new()
+    }
+}
diff --git a/book/listings/gobject_signals/3/custom_button/mod.rs b/book/listings/gobject_signals/3/custom_button/mod.rs
index cd261421e0c2..b7df3d1fa71e 100644
--- a/book/listings/gobject_signals/3/custom_button/mod.rs
+++ b/book/listings/gobject_signals/3/custom_button/mod.rs
@@ -12,3 +12,9 @@ impl CustomButton {
         glib::Object::new(&[]).expect("Failed to create Button")
     }
 }
+
+impl Default for CustomButton {
+    fn default() -> Self {
+        CustomButton::new()
+    }
+}
diff --git a/book/listings/gobject_subclassing/1/custom_button/mod.rs b/book/listings/gobject_subclassing/1/custom_button/mod.rs
index 8cd26311a338..6f337d78b74e 100644
--- a/book/listings/gobject_subclassing/1/custom_button/mod.rs
+++ b/book/listings/gobject_subclassing/1/custom_button/mod.rs
@@ -16,3 +16,9 @@ impl CustomButton {
         glib::Object::new(&[("label", &label)]).expect("Failed to create Button")
     }
 }
+
+impl Default for CustomButton {
+    fn default() -> Self {
+        CustomButton::new()
+    }
+}
diff --git a/book/listings/gobject_subclassing/2/custom_button/mod.rs b/book/listings/gobject_subclassing/2/custom_button/mod.rs
index cd261421e0c2..b7df3d1fa71e 100644
--- a/book/listings/gobject_subclassing/2/custom_button/mod.rs
+++ b/book/listings/gobject_subclassing/2/custom_button/mod.rs
@@ -12,3 +12,9 @@ impl CustomButton {
         glib::Object::new(&[]).expect("Failed to create Button")
     }
 }
+
+impl Default for CustomButton {
+    fn default() -> Self {
+        CustomButton::new()
+    }
+}