diff --git a/src/main/java/cc/carm/plugin/userprefix/hooker/UserPrefixExpansion.java b/src/main/java/cc/carm/plugin/userprefix/hooker/UserPrefixExpansion.java
index dae966b..6302ef8 100644
--- a/src/main/java/cc/carm/plugin/userprefix/hooker/UserPrefixExpansion.java
+++ b/src/main/java/cc/carm/plugin/userprefix/hooker/UserPrefixExpansion.java
@@ -12,24 +12,25 @@ import java.util.List;
 
 public class UserPrefixExpansion extends PlaceholderExpansion {
 
-    protected final @NotNull Main plugin;
-    protected final @NotNull List<String> placeholders = Arrays.asList(
-            "%UserPrefix_prefix%", "%UserPrefix_amount%",  "%UserPrefix_weight%",
+    protected static final @NotNull List<String> SUPPORTED_PLACEHOLDERS = Arrays.asList(
+            "%UserPrefix_prefix%", "%UserPrefix_amount%", "%UserPrefix_weight%",
             "%UserPrefix_identifier%", "%UserPrefix_name%",
             "%UserPrefix_has_<Identifier>%"
     );
 
+    protected final @NotNull Main plugin;
+
     public UserPrefixExpansion(@NotNull Main plugin) {
         this.plugin = plugin;
     }
 
     @Override
     public @NotNull List<String> getPlaceholders() {
-        return this.placeholders;
+        return SUPPORTED_PLACEHOLDERS;
     }
 
     @Override
-    public boolean canRegister() {
+    public boolean persist() {
         return true;
     }