diff --git a/src/functions/partition.rs b/src/functions/partition.rs
index a094f4a..5be84d3 100755
--- a/src/functions/partition.rs
+++ b/src/functions/partition.rs
@@ -785,7 +785,7 @@ pub fn mount(partition: &str, mountpoint: &str, options: &str) {
     }
 }
 
-fn umount(mountpoint: &str) {
+pub fn umount(mountpoint: &str) {
     exec_eval(
         exec("umount", vec![String::from(mountpoint)]),
         format!("unmount {}", mountpoint).as_str(),
diff --git a/src/internal/install.rs b/src/internal/install.rs
index b15d13a..7d94d43 100755
--- a/src/internal/install.rs
+++ b/src/internal/install.rs
@@ -1,4 +1,6 @@
 use crate::internal::*;
+use crate::functions::partition::mount;
+use crate::functions::partition::umount;
 use std::process::Command;
 
 pub fn install(pkgs: Vec<&str>) {
@@ -6,4 +8,5 @@ pub fn install(pkgs: Vec<&str>) {
         Command::new("pacstrap").arg("/mnt").args(&pkgs).status(),
         format!("Install packages {}", pkgs.join(", ")).as_str(),
     );
+    umount("/mnt/dev");
 }