diff --git a/tests/by-util/test_install.rs b/tests/by-util/test_install.rs
index 411de61f3..af48a0e66 100644
--- a/tests/by-util/test_install.rs
+++ b/tests/by-util/test_install.rs
@@ -2,6 +2,8 @@ use crate::common::util::*;
 use filetime::FileTime;
 use rust_users::*;
 use std::os::unix::fs::PermissionsExt;
+#[cfg(target_os = "linux")]
+use std::thread::sleep;
 
 #[test]
 fn test_install_help() {
@@ -452,7 +454,6 @@ fn test_install_copy_then_compare_file() {
 
 #[test]
 #[cfg(target_os = "linux")]
-#[ignore]
 fn test_install_copy_then_compare_file_with_extra_mode() {
     let scene = TestScenario::new(util_name!());
     let at = &scene.fixtures;
@@ -471,6 +472,7 @@ fn test_install_copy_then_compare_file_with_extra_mode() {
 
     let mut file2_meta = at.metadata(file2);
     let before = FileTime::from_last_modification_time(&file2_meta);
+    sleep(std::time::Duration::from_millis(1000));
 
     scene
         .ucmd()
@@ -487,6 +489,8 @@ fn test_install_copy_then_compare_file_with_extra_mode() {
 
     assert!(before != after_install_sticky);
 
+    sleep(std::time::Duration::from_millis(1000));
+
     // dest file still 1644, so need_copy ought to return `true`
     scene
         .ucmd()