diff --git a/build.gradle b/build.gradle
index 6c60dd699..9bc109501 100644
--- a/build.gradle
+++ b/build.gradle
@@ -231,4 +231,14 @@ publishing {
 
 mixin {
     add sourceSets.main, "lod.refmap.json"
+}
+
+// add Distant Horizon Core's source folders
+sourceSets {
+    core {
+        java {
+            srcDirs("core/src/main/java");
+            srcDirs("core/src/main/resources")
+        }
+    }
 }
\ No newline at end of file