diff --git a/src/uu/kill/src/kill.rs b/src/uu/kill/src/kill.rs
index 110e8a7a6..632055b80 100644
--- a/src/uu/kill/src/kill.rs
+++ b/src/uu/kill/src/kill.rs
@@ -190,7 +190,8 @@ fn list(signals: &Vec<String>) {
 }
 
 fn parse_signal_value(signal_name: &str) -> UResult<usize> {
-    let optional_signal_value = signal_by_name_or_value(signal_name);
+    let signal_name_upcase = signal_name.to_uppercase();
+    let optional_signal_value = signal_by_name_or_value(&signal_name_upcase);
     match optional_signal_value {
         Some(x) => Ok(x),
         None => Err(USimpleError::new(
diff --git a/tests/by-util/test_kill.rs b/tests/by-util/test_kill.rs
index 73b98f218..4a6dd017b 100644
--- a/tests/by-util/test_kill.rs
+++ b/tests/by-util/test_kill.rs
@@ -236,6 +236,17 @@ fn test_kill_with_signal_name_new_form() {
     assert_eq!(target.wait_for_signal(), Some(libc::SIGKILL));
 }
 
+#[test]
+fn test_kill_with_signal_name_new_form_ignore_case() {
+    let mut target = Target::new();
+    new_ucmd!()
+        .arg("-s")
+        .arg("KiLl")
+        .arg(format!("{}", target.pid()))
+        .succeeds();
+    assert_eq!(target.wait_for_signal(), Some(libc::SIGKILL));
+}
+
 #[test]
 fn test_kill_with_signal_prefixed_name_new_form() {
     let mut target = Target::new();
@@ -247,6 +258,29 @@ fn test_kill_with_signal_prefixed_name_new_form() {
     assert_eq!(target.wait_for_signal(), Some(libc::SIGKILL));
 }
 
+#[test]
+fn test_kill_with_signal_prefixed_name_new_form_ignore_case() {
+    let mut target = Target::new();
+    new_ucmd!()
+        .arg("-s")
+        .arg("SiGKiLl")
+        .arg(format!("{}", target.pid()))
+        .succeeds();
+    assert_eq!(target.wait_for_signal(), Some(libc::SIGKILL));
+}
+
+#[test]
+fn test_kill_with_signal_name_new_form_unknown_must_match_input_case() {
+    let target = Target::new();
+    new_ucmd!()
+        .arg("-s")
+        .arg("IaMnOtAsIgNaL") // spell-checker:disable-line
+        .arg(format!("{}", target.pid()))
+        .fails()
+        .stderr_contains("unknown signal")
+        .stderr_contains("IaMnOtAsIgNaL"); // spell-checker:disable-line
+}
+
 #[test]
 fn test_kill_no_pid_provided() {
     // spell-checker:disable-line