diff --git a/InterstellarFuelSwitch/InterstellarFuelSwitch-3.6.15.1.ckan b/InterstellarFuelSwitch/InterstellarFuelSwitch-3.6.15.1.ckan
index a75a3eb5a0..20b426db90 100644
--- a/InterstellarFuelSwitch/InterstellarFuelSwitch-3.6.15.1.ckan
+++ b/InterstellarFuelSwitch/InterstellarFuelSwitch-3.6.15.1.ckan
@@ -12,7 +12,7 @@
         "x_screenshot": "https://spacedock.info/content/FreeThinker_517/Interstellar_Fuel_Switch/Interstellar_Fuel_Switch-1481278354.0821617.jpg"
     },
     "version": "3.6.15.1",
-    "ksp_version": "1.5.1",
+    "ksp_version": "1.4.5",
     "depends": [
         {
             "name": "CommunityResourcePack",