diff --git a/WindTunnel/WindTunnel-1.3.1.1.ckan b/WindTunnel/WindTunnel-1.3.1.1.ckan
index fa5e4f39dd..1fadbe3854 100644
--- a/WindTunnel/WindTunnel-1.3.1.1.ckan
+++ b/WindTunnel/WindTunnel-1.3.1.1.ckan
@@ -1,5 +1,5 @@
 {
-    "spec_version": "v1.4",
+    "spec_version": 1,
     "identifier": "WindTunnel",
     "name": "Kerbal Wind Tunnel",
     "abstract": "This mod lets you see the flight envelope and performance graphs for your spaceplanes.",