diff --git a/CHANGELIST.md b/CHANGELIST.md
index 93d16f8e..0ca6bebf 100644
--- a/CHANGELIST.md
+++ b/CHANGELIST.md
@@ -58,6 +58,7 @@
 - Better helper method organization
 - Start supporting ordered tags and non-tags
 - Add more non-tag support; rearrange info window
+- Fix incorrect language three-letter code
 
 ### 2.2 (2021-12-30)
 - Fix Saturn header finding
diff --git a/MPF.Test/RedumpLib/ExtensionsTests.cs b/MPF.Test/RedumpLib/ExtensionsTests.cs
index 7d3db19c..a68ddbae 100644
--- a/MPF.Test/RedumpLib/ExtensionsTests.cs
+++ b/MPF.Test/RedumpLib/ExtensionsTests.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Data;
 using System.Linq;
 using RedumpLib.Data;
 using Xunit;
@@ -250,6 +251,87 @@ namespace MPF.Test.RedumpLib
                 Assert.NotNull(actual);
         }
 
+        /// <summary>
+        /// Ensure that every Language that has an ISO 639-1 code is unique
+        /// </summary>
+        [Fact]
+        public void NoDuplicateTwoLetterCodeTest()
+        {
+            var fullLanguages = Enum.GetValues(typeof(Language)).Cast<Language?>().ToList();
+            var filteredLanguages = new Dictionary<string, Language?>();
+
+            int totalCount = 0;
+            foreach (Language? language in fullLanguages)
+            {
+                string code = language.TwoLetterCode();
+                if (string.IsNullOrWhiteSpace(code))
+                    continue;
+
+                // Throw if the code already exists
+                if (filteredLanguages.ContainsKey(code))
+                    throw new DuplicateNameException($"Code {code} already in dictionary");
+
+                filteredLanguages[code] = language;
+                totalCount++;
+            }
+
+            Assert.Equal(totalCount, filteredLanguages.Count);
+        }
+
+        /// <summary>
+        /// Ensure that every Language that has a standard/bibliographic ISO 639-2 code is unique
+        /// </summary>
+        [Fact]
+        public void NoDuplicateThreeLetterCodeTest()
+        {
+            var fullLanguages = Enum.GetValues(typeof(Language)).Cast<Language?>().ToList();
+            var filteredLanguages = new Dictionary<string, Language?>();
+
+            int totalCount = 0;
+            foreach (Language? language in fullLanguages)
+            {
+                string code = language.ThreeLetterCode();
+                if (string.IsNullOrWhiteSpace(code))
+                    continue;
+
+                // Throw if the code already exists
+                if (filteredLanguages.ContainsKey(code))
+                    throw new DuplicateNameException($"Code {code} already in dictionary");
+
+                filteredLanguages[code] = language;
+                totalCount++;
+            }
+
+            Assert.Equal(totalCount, filteredLanguages.Count);
+        }
+
+        /// <summary>
+        /// Ensure that every Language that has a terminology ISO 639-2 code is unique
+        /// </summary>
+        [Fact]
+        public void NoDuplicateThreeLetterCodeAltTest()
+        {
+            var fullLanguages = Enum.GetValues(typeof(Language)).Cast<Language?>().ToList();
+            var filteredLanguages = new Dictionary<string, Language?>();
+
+            int totalCount = 0;
+            foreach (Language? language in fullLanguages)
+            {
+                string code = language.ThreeLetterCodeAlt();
+                if (string.IsNullOrWhiteSpace(code))
+                    continue;
+
+                // Throw if the code already exists
+                if (filteredLanguages.ContainsKey(code))
+                    throw new DuplicateNameException($"Code {code} already in dictionary");
+
+                filteredLanguages[code] = language;
+                totalCount++;
+            }
+
+            Assert.Equal(totalCount, filteredLanguages.Count);
+        }
+
         /// <summary>
         /// Generate a test set of Language values
         /// </summary>
diff --git a/RedumpLib/Data/Enumerations.cs b/RedumpLib/Data/Enumerations.cs
index c204e2c0..72a31a66 100644
--- a/RedumpLib/Data/Enumerations.cs
+++ b/RedumpLib/Data/Enumerations.cs
@@ -842,7 +842,7 @@ namespace RedumpLib.Data
         [Language(LongName = "Lozi", ThreeLetterCode = "loz")]
         Lozi,
 
-        [Language(LongName = "Luba-Katanga", TwoLetterCode = "lu", ThreeLetterCode = "loz")]
+        [Language(LongName = "Luba-Katanga", TwoLetterCode = "lu", ThreeLetterCode = "lub")]
         LubaKatanga,
 
         [Language(LongName = "Luba-Lulua", ThreeLetterCode = "lua")]
diff --git a/RedumpLib/Data/Extensions.cs b/RedumpLib/Data/Extensions.cs
index b31e8fd6..bb968ae9 100644
--- a/RedumpLib/Data/Extensions.cs
+++ b/RedumpLib/Data/Extensions.cs
@@ -970,21 +970,21 @@ namespace RedumpLib.Data
         /// </summary>
         /// <param name="language"></param>
         /// <returns></returns>
-        private static string ThreeLetterCode(this Language? language) => ((LanguageAttribute)AttributeHelper<Language?>.GetAttribute(language))?.ThreeLetterCode;
+        public static string ThreeLetterCode(this Language? language) => ((LanguageAttribute)AttributeHelper<Language?>.GetAttribute(language))?.ThreeLetterCode;
 
         /// <summary>
         /// Get the ISO 639-2 alternate code for each known language
         /// </summary>
         /// <param name="language"></param>
         /// <returns></returns>
-        private static string ThreeLetterCodeAlt(this Language? language) => ((LanguageAttribute)AttributeHelper<Language?>.GetAttribute(language))?.ThreeLetterCodeAlt;
+        public static string ThreeLetterCodeAlt(this Language? language) => ((LanguageAttribute)AttributeHelper<Language?>.GetAttribute(language))?.ThreeLetterCodeAlt;
 
         /// <summary>
         /// Get the ISO 639-1 code for each known language
         /// </summary>
         /// <param name="language"></param>
         /// <returns></returns>
-        private static string TwoLetterCode(this Language? language) => ((LanguageAttribute)AttributeHelper<Language?>.GetAttribute(language))?.TwoLetterCode;
+        public static string TwoLetterCode(this Language? language) => ((LanguageAttribute)AttributeHelper<Language?>.GetAttribute(language))?.TwoLetterCode;
 
         #endregion