diff --git a/Tests/LibUnicode/TestUnicodeLocale.cpp b/Tests/LibUnicode/TestUnicodeLocale.cpp
index 03f19695c0..85bf18dac2 100644
--- a/Tests/LibUnicode/TestUnicodeLocale.cpp
+++ b/Tests/LibUnicode/TestUnicodeLocale.cpp
@@ -312,6 +312,10 @@ TEST_CASE(canonicalize_unicode_locale_id)
     test("EN-U-KS-PRIMARY"sv, "en-u-ks-level1"sv);
     test("en-u-ka-primary"sv, "en-u-ka-primary"sv);
     test("EN-U-KA-PRIMARY"sv, "en-u-ka-primary"sv);
+    test("en-u-ms-imperial"sv, "en-u-ms-uksystem"sv);
+    test("EN-U-MS-IMPERIAL"sv, "en-u-ms-uksystem"sv);
+    test("en-u-ma-imperial"sv, "en-u-ma-imperial"sv);
+    test("EN-U-MA-IMPERIAL"sv, "en-u-ma-imperial"sv);
 
     test("en-t-en"sv, "en-t-en"sv);
     test("EN-T-EN"sv, "en-t-en"sv);
@@ -333,6 +337,8 @@ TEST_CASE(canonicalize_unicode_locale_id)
     test("EN-T-K1-NAMES"sv, "en-t-k1-names"sv);
     test("en-t-k1-primary"sv, "en-t-k1-primary"sv);
     test("EN-T-K1-PRIMARY"sv, "en-t-k1-primary"sv);
+    test("en-t-k1-imperial"sv, "en-t-k1-imperial"sv);
+    test("EN-T-K1-IMPERIAL"sv, "en-t-k1-imperial"sv);
 
     test("en-0-aaa"sv, "en-0-aaa"sv);
     test("EN-0-AAA"sv, "en-0-aaa"sv);
diff --git a/Userland/Libraries/LibUnicode/Locale.cpp b/Userland/Libraries/LibUnicode/Locale.cpp
index db699778f0..5815f3678e 100644
--- a/Userland/Libraries/LibUnicode/Locale.cpp
+++ b/Userland/Libraries/LibUnicode/Locale.cpp
@@ -484,6 +484,7 @@ static void perform_hard_coded_key_value_substitutions(String& key, String& valu
 {
     // FIXME: In the XML export of CLDR, there are some aliases defined in the following files:
     // https://github.com/unicode-org/cldr-staging/blob/master/production/common/bcp47/collation.xml
+    // https://github.com/unicode-org/cldr-staging/blob/master/production/common/bcp47/measure.xml
     // https://github.com/unicode-org/cldr-staging/blob/master/production/common/bcp47/transform.xml
     //
     // There doesn't seem to be a counterpart in the JSON export. Since there aren't many such
@@ -499,6 +500,8 @@ static void perform_hard_coded_key_value_substitutions(String& key, String& valu
         // but those are semantically incorrect values (they are too long), so they can be skipped.
     } else if ((key == "m0"sv) && (value == "names"sv)) {
         value = "prprname"sv;
+    } else if ((key == "ms"sv) && (value == "imperial"sv)) {
+        value = "uksystem"sv;
     }
 }