diff --git a/src/client/index.ts b/src/client/index.ts
index 453cbff..2d4a3b6 100644
--- a/src/client/index.ts
+++ b/src/client/index.ts
@@ -59,7 +59,13 @@ const formatMessage: Formatter = (id, options = {}) => {
   const message = lookupMessage(id, locale)
 
   if (!message) {
-    console.warn(`[svelte-i18n] The message "${id}" was not found in the locale "${locale}".`)
+    console.warn(
+      `[svelte-i18n] The message "${id}" was not found in "${locale
+        .split('-')
+        .map((_, i, arr) => arr.slice(0, i + 1).join('-'))
+        .reverse()
+        .join('", "')}".`,
+    )
     if (defaultValue != null) return defaultValue
     return id
   }
diff --git a/test/client/index.test.ts b/test/client/index.test.ts
index d20a4dd..e872f95 100644
--- a/test/client/index.test.ts
+++ b/test/client/index.test.ts
@@ -137,8 +137,8 @@ describe('utilities', () => {
     })
 
     it('should get the fallback locale', () => {
-      expect(getClientLocale({ navigator: false, fallback: 'pt' })).toBe('pt')
-      expect(getClientLocale({ hash: 'locale', fallback: 'pt' })).toBe('pt')
+      expect(getClientLocale({ navigator: false, default: 'pt' })).toBe('pt')
+      expect(getClientLocale({ hash: 'locale', default: 'pt' })).toBe('pt')
     })
   })