diff --git a/cache/src/main/kotlin/org/openrs2/cache/Js5MasterIndexProvider.kt b/cache/src/main/kotlin/org/openrs2/cache/Js5MasterIndexProvider.kt
index 10844646..f0d66bc3 100644
--- a/cache/src/main/kotlin/org/openrs2/cache/Js5MasterIndexProvider.kt
+++ b/cache/src/main/kotlin/org/openrs2/cache/Js5MasterIndexProvider.kt
@@ -7,6 +7,8 @@ public class Js5MasterIndexProvider @Inject constructor(
     private val store: Store
 ) : Provider<Js5MasterIndex> {
     override fun get(): Js5MasterIndex {
-        return Js5MasterIndex.create(store)
+        val masterIndex = Js5MasterIndex.create(store)
+        masterIndex.format = MasterIndexFormat.VERSIONED
+        return masterIndex
     }
 }