diff --git a/ext/js/language/la/latin-text-preprocessors.js b/ext/js/language/la/latin-text-preprocessors.js
index 0a115f461..1a8a8ab09 100644
--- a/ext/js/language/la/latin-text-preprocessors.js
+++ b/ext/js/language/la/latin-text-preprocessors.js
@@ -16,20 +16,18 @@
  */
 
 /** @type {import('language').BidirectionalConversionPreprocessor} */
-export const processDiphtongAE = {
+export const processDiphtongs = {
     name: 'Convert æ to ae',
-    description: 'æ → ae, Æ → AE, ae → æ, AE → Æ',
+    description: 'æ → ae, Æ → AE, œ → oe, Œ → OE',
     options: ['off', 'direct', 'inverse'],
     process: (str, setting) => {
         switch (setting) {
             case 'off':
                 return str;
             case 'direct':
-                return str.replace(/æ/g, 'ae').replace(/Æ/g, 'AE');
+                return str.replace(/æ/g, 'ae').replace(/Æ/g, 'AE').replace(/œ/g, 'oe').replace(/Œ/g, 'OE');
             case 'inverse':
-                return str.replace(/ae/g, 'æ').replace(/AE/g, 'Æ');
+                return str.replace(/ae/g, 'æ').replace(/AE/g, 'Æ').replace(/oe/g, 'œ').replace(/OE/g, 'Œ');
         }
     },
-
-
 };
diff --git a/ext/js/language/language-descriptors.js b/ext/js/language/language-descriptors.js
index 5547d3bc1..85976621d 100644
--- a/ext/js/language/language-descriptors.js
+++ b/ext/js/language/language-descriptors.js
@@ -37,7 +37,7 @@ import {japaneseTransforms} from './ja/japanese-transforms.js';
 import {isStringPartiallyJapanese} from './ja/japanese.js';
 import {disassembleHangul, reassembleHangul} from './ko/korean-text-processors.js';
 import {koreanTransforms} from './ko/korean-transforms.js';
-import {processDiphtongAE} from './la/latin-text-preprocessors.js';
+import {processDiphtongs} from './la/latin-text-preprocessors.js';
 import {latinTransforms} from './la/latin-transforms.js';
 import {removeRussianDiacritics, yoToE} from './ru/russian-text-preprocessors.js';
 import {oldIrishTransforms} from './sga/old-irish-transforms.js';
@@ -207,7 +207,7 @@ const languageDescriptors = [
         textPreprocessors: {
             ...capitalizationPreprocessors,
             removeAlphabeticDiacritics,
-            processDiphtongAE,
+            processDiphtongs,
         },
         languageTransforms: latinTransforms,
     },
diff --git a/types/ext/language-descriptors.d.ts b/types/ext/language-descriptors.d.ts
index 9fd5df095..82c46acb3 100644
--- a/types/ext/language-descriptors.d.ts
+++ b/types/ext/language-descriptors.d.ts
@@ -130,7 +130,7 @@ type AllTextProcessors = {
     };
     la: {
         pre: CapitalizationPreprocessors & AlphabeticDiacriticsProcessor & {
-            processDiphtongAE: BidirectionalConversionPreprocessor;
+            processDiphtongs: BidirectionalConversionPreprocessor;
         };
     };
     lo: Record<string, never>;