diff --git a/RealFuelsISRU/RealFuelsISRU-1.ckan b/RealFuelsISRU/RealFuelsISRU-1.ckan
index e713093396..5574bd0b3e 100644
--- a/RealFuelsISRU/RealFuelsISRU-1.ckan
+++ b/RealFuelsISRU/RealFuelsISRU-1.ckan
@@ -1,5 +1,5 @@
 {
-    "spec_version": "v1.18",
+    "spec_version": "v1.4",
     "identifier": "RealFuelsISRU",
     "name": "RealFuels ISRU",
     "abstract": "A ModuleManager patch file that allows ISRUs to make Aerozine50, NTO, Kerosene, LqdOxygen, Ethanol75, and HTP to be more compatible with the RealFuels KSP Mod",