diff --git a/.env.example b/.env.example
index 2d45ff580e..f8e1df2987 100644
--- a/.env.example
+++ b/.env.example
@@ -6,7 +6,7 @@ APP_DEBUG=false
 APP_KEY=ChangeMe
 APP_URL=null
 APP_TIMEZONE='UTC'
-APP_LOCALE=en
+APP_LOCALE='en-US'
 MAX_RESULTS=500
 
 # --------------------------------------------
diff --git a/.env.testing-ci b/.env.testing-ci
index 82cd285700..f17a5c6c30 100644
--- a/.env.testing-ci
+++ b/.env.testing-ci
@@ -6,7 +6,7 @@ APP_DEBUG=false
 APP_KEY='base64:glJpcM7BYwWiBggp3SQ/+NlRkqsBQMaGEOjemXqJzOU='
 APP_URL='http://localhost:8000'
 APP_TIMEZONE='US/Pacific'
-APP_LOCALE=en
+APP_LOCALE='en-US'
 FILESYSTEM_DISK=local
 
 # --------------------------------------------
diff --git a/.env.testing.example b/.env.testing.example
index 3391d62726..26211f95c3 100644
--- a/.env.testing.example
+++ b/.env.testing.example
@@ -6,7 +6,7 @@ APP_DEBUG=true
 APP_KEY=base64:glJpcM7BYwWiBggp3SQ/+NlRkqsBQMaGEOjemXqJzOU=
 APP_URL=http://localhost:8000
 APP_TIMEZONE='UTC'
-APP_LOCALE=en
+APP_LOCALE='en-US'
 
 # --------------------------------------------
 # REQUIRED: DATABASE SETTINGS