diff --git a/tests/test_pinky.rs b/tests/test_pinky.rs
index 780ee23ed..0821a40ba 100644
--- a/tests/test_pinky.rs
+++ b/tests/test_pinky.rs
@@ -48,5 +48,5 @@ fn test_short_format() {
 
 #[cfg(target_os = "linux")]
 fn expected_result(args: &[&str]) -> String {
-    TestScenario::new(util_name!()).cmd_keepenv(util_name!()).args(args).run().stdout
+    TestScenario::new(util_name!()).cmd_keepenv(util_name!()).env("LANGUAGE", "C").args(args).run().stdout
 }
diff --git a/tests/test_stat.rs b/tests/test_stat.rs
index 668e1ecfe..cac756548 100644
--- a/tests/test_stat.rs
+++ b/tests/test_stat.rs
@@ -235,6 +235,6 @@ fn test_printf() {
 fn expected_result(args: &[&str]) -> String {
     use std::process::Command;
 
-    let output = Command::new(util_name!()).args(args).output().unwrap();
+    let output = Command::new(util_name!()).env("LANGUAGE", "C").args(args).output().unwrap();
     String::from_utf8_lossy(&output.stdout).into_owned()
 }
diff --git a/tests/test_who.rs b/tests/test_who.rs
index c32adac19..039f2e86c 100644
--- a/tests/test_who.rs
+++ b/tests/test_who.rs
@@ -68,5 +68,5 @@ fn test_all() {
 
 #[cfg(target_os = "linux")]
 fn expected_result(arg: &str) -> String {
-    TestScenario::new(util_name!()).cmd_keepenv(util_name!()).args(&[arg]).run().stdout
+    TestScenario::new(util_name!()).cmd_keepenv(util_name!()).env("LANGUAGE", "C").args(&[arg]).run().stdout
 }