diff --git a/build.gradle.kts b/build.gradle.kts
index 6199f5b..0416606 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -131,6 +131,7 @@ tasks {
         manifest {
             attributes(
                 "ModSide" to "BOTH",
+                "FMLAT" to "${id}_at.cfg",
                 "FMLCorePlugin" to plugin,
                 "FMLCorePluginContainsFMLMod" to "true",
                 "ForceLoadAsMod" to "true"