diff --git a/.changeset/curvy-timers-play.md b/.changeset/curvy-timers-play.md
new file mode 100644
index 0000000000..c5dcdacb16
--- /dev/null
+++ b/.changeset/curvy-timers-play.md
@@ -0,0 +1,5 @@
+---
+"@clerk/localizations": patch
+---
+
+Add missing localization key for invalid phone_number (unstable error) in the en-US localization
diff --git a/packages/localizations/src/en-US.ts b/packages/localizations/src/en-US.ts
index c9946474b1..38679e5c98 100644
--- a/packages/localizations/src/en-US.ts
+++ b/packages/localizations/src/en-US.ts
@@ -715,6 +715,7 @@ export const enUS: LocalizationResource = {
     form_username_invalid_length: '',
     form_username_invalid_character: '',
     form_param_format_invalid: '',
+    form_param_format_invalid__phone_number: 'Phone number must be in a valid international format',
     form_param_format_invalid__email_address: 'Email address must be a valid email address.',
     form_password_length_too_short: '',
     form_param_nil: '',