diff --git a/common/src/main/java/me/lucko/luckperms/common/calculator/PermissionCalculator.java b/common/src/main/java/me/lucko/luckperms/common/calculator/PermissionCalculator.java
index 9732120b..df5bf68b 100644
--- a/common/src/main/java/me/lucko/luckperms/common/calculator/PermissionCalculator.java
+++ b/common/src/main/java/me/lucko/luckperms/common/calculator/PermissionCalculator.java
@@ -25,26 +25,25 @@
 
 package me.lucko.luckperms.common.calculator;
 
-import com.github.benmanes.caffeine.cache.CacheLoader;
-import com.github.benmanes.caffeine.cache.Caffeine;
-import com.github.benmanes.caffeine.cache.LoadingCache;
 import com.google.common.collect.ImmutableList;
 
 import me.lucko.luckperms.api.Tristate;
 import me.lucko.luckperms.common.cacheddata.CacheMetadata;
 import me.lucko.luckperms.common.calculator.processor.PermissionProcessor;
 import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
+import me.lucko.luckperms.common.util.LoadingMap;
 import me.lucko.luckperms.common.verbose.event.PermissionCheckEvent;
 
 import org.checkerframework.checker.nullness.qual.NonNull;
 
 import java.util.List;
 import java.util.Map;
+import java.util.function.Function;
 
 /**
  * Calculates and caches permissions
  */
-public class PermissionCalculator implements CacheLoader<String, Tristate> {
+public class PermissionCalculator implements Function<String, Tristate> {
 
     /**
      * The plugin instance
@@ -64,7 +63,7 @@ public class PermissionCalculator implements CacheLoader<String, Tristate> {
     /**
      * Loading cache for permission checks
      */
-    private final LoadingCache<String, Tristate> lookupCache = Caffeine.newBuilder().build(this);
+    private final LoadingMap<String, Tristate> lookupCache = LoadingMap.of(this);
 
     public PermissionCalculator(LuckPermsPlugin plugin, CacheMetadata metadata, ImmutableList<PermissionProcessor> processors) {
         this.plugin = plugin;
@@ -97,7 +96,7 @@ public class PermissionCalculator implements CacheLoader<String, Tristate> {
     }
 
     @Override
-    public Tristate load(@NonNull String permission) {
+    public Tristate apply(@NonNull String permission) {
         // offer the permission to the permission vault
         // we only need to do this once per permission, so it doesn't matter
         // that this call is behind the cache.
@@ -131,6 +130,6 @@ public class PermissionCalculator implements CacheLoader<String, Tristate> {
     }
 
     public void invalidateCache() {
-        this.lookupCache.invalidateAll();
+        this.lookupCache.clear();
     }
 }
diff --git a/common/src/main/java/me/lucko/luckperms/common/util/LoadingMap.java b/common/src/main/java/me/lucko/luckperms/common/util/LoadingMap.java
new file mode 100644
index 00000000..85d7060a
--- /dev/null
+++ b/common/src/main/java/me/lucko/luckperms/common/util/LoadingMap.java
@@ -0,0 +1,116 @@
+/*
+ * This file is part of LuckPerms, licensed under the MIT License.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  Permission is hereby granted, free of charge, to any person obtaining a copy
+ *  of this software and associated documentation files (the "Software"), to deal
+ *  in the Software without restriction, including without limitation the rights
+ *  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ *  copies of the Software, and to permit persons to whom the Software is
+ *  furnished to do so, subject to the following conditions:
+ *
+ *  The above copyright notice and this permission notice shall be included in all
+ *  copies or substantial portions of the Software.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ *  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ *  SOFTWARE.
+ */
+
+package me.lucko.luckperms.common.util;
+
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Function;
+
+public interface LoadingMap<K, V> extends Map<K, V> {
+    static <K, V> LoadingMap<K, V> of(Map<K, V> map, Function<K, V> function) {
+        return new LoadingMapImpl<>(map, function);
+    }
+
+    static <K, V> LoadingMap<K, V> of(Function<K, V> function) {
+        return of(new ConcurrentHashMap<>(), function);
+    }
+}
+
+final class LoadingMapImpl<K, V> implements LoadingMap<K, V> {
+    private final Map<K, V> map;
+    private final Function<K, V> function;
+
+    LoadingMapImpl(Map<K, V> map, Function<K, V> function) {
+        this.map = map;
+        this.function = function;
+    }
+
+    @Override
+    public int size() {
+        return this.map.size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return this.map.isEmpty();
+    }
+
+    @Override
+    public boolean containsKey(Object key) {
+        return this.map.containsKey(key);
+    }
+
+    @Override
+    public boolean containsValue(Object value) {
+        return this.map.containsValue(value);
+    }
+
+    @Override
+    public V get(Object key) {
+        V value = this.map.get(key);
+        if (value != null) {
+            return value;
+        }
+        return this.map.computeIfAbsent((K) key, this.function);
+    }
+
+    @Override
+    public V put(K key, V value) {
+        return this.map.put(key, value);
+    }
+
+    @Override
+    public V remove(Object key) {
+        return this.map.remove(key);
+    }
+
+    @Override
+    public void putAll(Map<? extends K, ? extends V> that) {
+        this.map.putAll(that);
+    }
+
+    @Override
+    public void clear() {
+        this.map.clear();
+    }
+
+    @Override
+    public Set<K> keySet() {
+        return this.map.keySet();
+    }
+
+    @Override
+    public Collection<V> values() {
+        return this.map.values();
+    }
+
+    @Override
+    public Set<Entry<K, V>> entrySet() {
+        return this.map.entrySet();
+    }
+}
\ No newline at end of file