diff --git a/packages/localize/src/tools/src/extract/main.ts b/packages/localize/src/tools/src/extract/main.ts
index 27d50f6212..646fab708e 100644
--- a/packages/localize/src/tools/src/extract/main.ts
+++ b/packages/localize/src/tools/src/extract/main.ts
@@ -208,7 +208,7 @@ export function extractTranslations({
 
 export function getSerializer(
     format: string, sourceLocale: string, rootPath: AbsoluteFsPath, useLegacyIds: boolean,
-    formatOptions: FormatOptions): TranslationSerializer {
+    formatOptions: FormatOptions = {}): TranslationSerializer {
   switch (format) {
     case 'xlf':
     case 'xlif':
diff --git a/packages/localize/src/tools/src/extract/translation_files/xliff1_translation_serializer.ts b/packages/localize/src/tools/src/extract/translation_files/xliff1_translation_serializer.ts
index f56a4addf2..6ff7643f13 100644
--- a/packages/localize/src/tools/src/extract/translation_files/xliff1_translation_serializer.ts
+++ b/packages/localize/src/tools/src/extract/translation_files/xliff1_translation_serializer.ts
@@ -27,7 +27,7 @@ const LEGACY_XLIFF_MESSAGE_LENGTH = 40;
 export class Xliff1TranslationSerializer implements TranslationSerializer {
   constructor(
       private sourceLocale: string, private basePath: AbsoluteFsPath, private useLegacyIds: boolean,
-      private formatOptions: FormatOptions) {
+      private formatOptions: FormatOptions = {}) {
     validateOptions('Xliff1TranslationSerializer', [['xml:space', ['preserve']]], formatOptions);
   }
 
diff --git a/packages/localize/src/tools/src/extract/translation_files/xliff2_translation_serializer.ts b/packages/localize/src/tools/src/extract/translation_files/xliff2_translation_serializer.ts
index 395e4c1bbe..d01fd63662 100644
--- a/packages/localize/src/tools/src/extract/translation_files/xliff2_translation_serializer.ts
+++ b/packages/localize/src/tools/src/extract/translation_files/xliff2_translation_serializer.ts
@@ -27,7 +27,7 @@ export class Xliff2TranslationSerializer implements TranslationSerializer {
   private currentPlaceholderId = 0;
   constructor(
       private sourceLocale: string, private basePath: AbsoluteFsPath, private useLegacyIds: boolean,
-      private formatOptions: FormatOptions) {
+      private formatOptions: FormatOptions = {}) {
     validateOptions('Xliff1TranslationSerializer', [['xml:space', ['preserve']]], formatOptions);
   }