diff --git a/GameData/RealSolarSystem/Compatibility/RationalResources.cfg b/GameData/RealSolarSystem/Compatibility/RationalResources.cfg
new file mode 100644
index 00000000..b9e396de
--- /dev/null
+++ b/GameData/RealSolarSystem/Compatibility/RationalResources.cfg
@@ -0,0 +1,2 @@
+// Let Rational Resources know that RSS is an "Alternate Universe" than Stock
+@REALSOLARSYSTEM:FOR[RationalResourcesAU] {}