diff --git a/GPPSecondary/GPPSecondary-1.6.4.0.ckan b/GPPSecondary/GPPSecondary-1.6.4.0.ckan
index b174fb42d2..cf41425843 100644
--- a/GPPSecondary/GPPSecondary-1.6.4.0.ckan
+++ b/GPPSecondary/GPPSecondary-1.6.4.0.ckan
@@ -21,6 +21,11 @@
         "config",
         "planet-pack"
     ],
+    "depends": [
+        {
+            "name": "Kopernicus"
+        }
+    ],
     "install": [
         {
             "find": "Optional Mods/GPP_Secondary/GameData/GPP_Secondary",