diff --git a/src/base.rs b/src/base.rs
index 7cfabf2..ffb269a 100644
--- a/src/base.rs
+++ b/src/base.rs
@@ -633,7 +633,7 @@ pub mod os {
                 Path::new(&self.extras.extras.home_dir)
             }
 
-            fn with_home_dir(mut self, home_dir: &str) -> User {
+            fn with_home_dir(self, home_dir: &str) -> User {
                 self.extras.extras.home_dir = home_dir.to_owned();
                 self
             }
@@ -642,7 +642,7 @@ pub mod os {
                 Path::new(&self.extras.extras.shell)
             }
 
-            fn with_shell(mut self, shell: &str) -> User {
+            fn with_shell(self, shell: &str) -> User {
                 self.extras.extras.shell = shell.to_owned();
                 self
             }