diff --git a/src/view/components/pages.rs b/src/view/components/pages.rs
index 95d9bdb..26a867e 100644
--- a/src/view/components/pages.rs
+++ b/src/view/components/pages.rs
@@ -27,7 +27,7 @@ impl Pages {
 impl PagesBuilder {
 
     fn append_page_private(
-        &mut self,
+        &self,
         page_name: &str,
         page_title: &str,
         content: &impl IsA<Widget>
@@ -36,7 +36,7 @@ impl PagesBuilder {
     }
 
     pub fn set_transition(
-        mut self,
+        self,
         type_transition : StackTransitionType,
         duration: u32
     ) -> Self {
@@ -47,7 +47,7 @@ impl PagesBuilder {
     }
 
     pub fn add_page(
-        mut self,
+        self,
         page_name: &str,
         page_title: &str,
         content: &impl IsA<Widget>
@@ -57,7 +57,7 @@ impl PagesBuilder {
     }
 
     pub fn add_pages(
-        mut self,
+        self,
         pages: Vec<(&str, &str, &impl IsA<Widget>)>,
     ) -> Self {
         pages.iter()
diff --git a/src/view/components/tabs.rs b/src/view/components/tabs.rs
index 326527f..fbe9d88 100644
--- a/src/view/components/tabs.rs
+++ b/src/view/components/tabs.rs
@@ -47,7 +47,7 @@ impl TabsBuilder {
         self
     }
 
-    pub fn build(&mut self, group_name: &str) -> Tabs {
+    pub fn build(&self, group_name: &str) -> Tabs {
         let tabs_wrapper = Notebook::builder()
             .group_name(group_name)
             .build();