diff --git a/MarkIVSpaceplaneSystem/MarkIVSpaceplaneSystem-3.0.4.ckan b/MarkIVSpaceplaneSystem/MarkIVSpaceplaneSystem-3.0.4.ckan
index cfbb359a6b..37a2771147 100644
--- a/MarkIVSpaceplaneSystem/MarkIVSpaceplaneSystem-3.0.4.ckan
+++ b/MarkIVSpaceplaneSystem/MarkIVSpaceplaneSystem-3.0.4.ckan
@@ -15,6 +15,9 @@
     "version": "3.0.4",
     "ksp_version_min": "1.6.0",
     "ksp_version_max": "1.6.99",
+    "localizations": [
+        "en-us"
+    ],
     "depends": [
         {
             "name": "ModuleManager"