diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/core/collect/SupplierMap.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/core/collect/SupplierMap.kt
index 3ce75a3f8..a53c6448f 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/core/collect/SupplierMap.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/core/collect/SupplierMap.kt
@@ -1,21 +1,25 @@
 package ru.dbotthepony.mc.otm.core.collect
 
-import com.google.common.collect.ImmutableMap
 import com.google.common.collect.ImmutableSet
+import it.unimi.dsi.fastutil.objects.Object2ObjectLinkedOpenHashMap
 import ru.dbotthepony.mc.otm.core.stream
 import java.util.function.Supplier
 import java.util.stream.Stream
 
 class SupplierMap<K, T>(values: Stream<Pair<K, Supplier<T>>>) : Map<K, T> {
+	private val backing = Object2ObjectLinkedOpenHashMap<K, Supplier<T>>()
 	override val entries: Set<Map.Entry<K, T>>
 	override val keys: Set<K>
 		get() = backing.keys
 	override val size: Int
 		get() = entries.size
 	override val values: Collection<T>
-	private val backing = values.collect(ImmutableMap.toImmutableMap({ it.first }, { it.second }))
 
 	init {
+		values.forEach {
+			backing[it.first] = it.second
+		}
+
 		entries = ImmutableSet.copyOf(backing.entries.map { Entry(it.key, it.value) })
 		this.values = SupplierList(backing.values)
 	}