diff --git a/gui/admin-gui/src/main/resources/initial-objects/200-lookup-languages.xml b/gui/admin-gui/src/main/resources/initial-objects/200-lookup-languages.xml
index 53fd23c16dc..4f09c4b1b1b 100644
--- a/gui/admin-gui/src/main/resources/initial-objects/200-lookup-languages.xml
+++ b/gui/admin-gui/src/main/resources/initial-objects/200-lookup-languages.xml
@@ -33,7 +33,7 @@
 		<label>Eesti</label>
 	</row>
 	<row>
-		<key>en_US</key>
+		<key>en</key>
 		<label>English</label>
 	</row>
 	<row>
diff --git a/gui/admin-gui/src/main/resources/initial-objects/210-lookup-locales.xml b/gui/admin-gui/src/main/resources/initial-objects/210-lookup-locales.xml
index 445c6827746..f47218e3bbc 100644
--- a/gui/admin-gui/src/main/resources/initial-objects/210-lookup-locales.xml
+++ b/gui/admin-gui/src/main/resources/initial-objects/210-lookup-locales.xml
@@ -33,7 +33,7 @@
 		<label>Eesti</label>
 	</row>
 	<row>
-		<key>en_US</key>
+		<key>en</key>
 		<label>English</label>
 	</row>
 	<row>
diff --git a/gui/admin-gui/src/main/resources/localization/Midpoint_en_US.properties b/gui/admin-gui/src/main/resources/localization/Midpoint_en.properties
similarity index 100%
rename from gui/admin-gui/src/main/resources/localization/Midpoint_en_US.properties
rename to gui/admin-gui/src/main/resources/localization/Midpoint_en.properties
diff --git a/infra/schema/src/main/resources/localization/schema_en_US.properties b/infra/schema/src/main/resources/localization/schema_en.properties
similarity index 100%
rename from infra/schema/src/main/resources/localization/schema_en_US.properties
rename to infra/schema/src/main/resources/localization/schema_en.properties