diff --git a/test-framework/sudo-compliance-tests/src/sudo/misc.rs b/test-framework/sudo-compliance-tests/src/sudo/misc.rs
index b7d7b1153..721fdd676 100644
--- a/test-framework/sudo-compliance-tests/src/sudo/misc.rs
+++ b/test-framework/sudo-compliance-tests/src/sudo/misc.rs
@@ -400,3 +400,21 @@ fn rootpw_takes_priority_over_targetpw() {
         .output(&env);
     assert!(!output.status().success());
 }
+
+#[cfg(target_os = "linux")]
+#[test]
+fn tish_you_spoke_french() {
+    let env = Env("")
+        .file("/tmp/install-po.sh", include_str!("misc/install-po.sh"))
+        .build();
+
+    let _ = Command::new("sh").arg("/tmp/install-po.sh").output(&env);
+
+    let output = Command::new("env")
+        .arg("LANG=fy_NL.utf8")
+        .args(["sudo", "true"])
+        .output(&env);
+
+    output.assert_exit_code(1);
+    assert_contains!(output.stderr(), "twadde weach");
+}
diff --git a/test-framework/sudo-compliance-tests/src/sudo/misc/install-po.sh b/test-framework/sudo-compliance-tests/src/sudo/misc/install-po.sh
new file mode 100644
index 000000000..3d0d83153
--- /dev/null
+++ b/test-framework/sudo-compliance-tests/src/sudo/misc/install-po.sh
@@ -0,0 +1,17 @@
+#! /bin/sh
+
+mkdir -p /usr/share/locale/fy/LC_MESSAGES/
+
+msgfmt - -o /usr/share/locale/fy/LC_MESSAGES/sudoers.mo <<EOF
+msgid "%s is not in the sudoers file.\n"
+msgstr "%s waard wegere troch de twadde weach.\n"
+EOF
+
+msgfmt - -o /usr/share/locale/fy/LC_MESSAGES/sudo-rs.mo <<EOF
+msgid "I'm sorry {user}. I'm afraid I can't do that"
+msgstr "{user} waard wegere troch de twadde weach."
+EOF
+
+# uncomment the frisian line
+sed -ibak '/fy_NL/s/^# *//' /etc/locale.gen
+locale-gen
diff --git a/test-framework/sudo-test/src/ours.linux.Dockerfile b/test-framework/sudo-test/src/ours.linux.Dockerfile
index 23b9529c9..8f7424c70 100644
--- a/test-framework/sudo-test/src/ours.linux.Dockerfile
+++ b/test-framework/sudo-test/src/ours.linux.Dockerfile
@@ -1,6 +1,6 @@
 FROM rust:1-slim-trixie
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends apparmor libpam0g-dev libapparmor1 procps sshpass rsyslog ca-certificates tzdata
+    apt-get install -y --no-install-recommends apparmor libpam0g-dev libapparmor1 procps sshpass rsyslog ca-certificates tzdata locales gettext
 # cache the crates.io index in the image for faster local testing
 RUN cargo search sudo
 WORKDIR /usr/src/sudo
diff --git a/test-framework/sudo-test/src/theirs.linux.Dockerfile b/test-framework/sudo-test/src/theirs.linux.Dockerfile
index fc49437e1..80874f267 100644
--- a/test-framework/sudo-test/src/theirs.linux.Dockerfile
+++ b/test-framework/sudo-test/src/theirs.linux.Dockerfile
@@ -1,6 +1,6 @@
 FROM debian:trixie-slim
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends sudo procps sshpass rsyslog && \
+    apt-get install -y --no-install-recommends sudo procps sshpass rsyslog locales gettext && \
     rm /etc/sudoers
 # Ensure we use the same shell across OSes
 RUN chsh -s /bin/sh