diff --git a/build.gradle.kts b/build.gradle.kts
index f9817f6b..07fd411e 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -72,6 +72,7 @@ tasks.processResources {
 tasks.jar {
     dependsOn(internal)
     from({ internal.map { zipTree(it) } })
+    manifest.attributes(mapOf("FMLModType" to "GAMELIBRARY"))
 }
 
 apiValidation {