diff --git a/src/main/java/haidnor/jvm/runtime/Slot.java b/src/main/java/haidnor/jvm/runtime/Slot.java
index 8dc909f..ae535d6 100644
--- a/src/main/java/haidnor/jvm/runtime/Slot.java
+++ b/src/main/java/haidnor/jvm/runtime/Slot.java
@@ -19,10 +19,6 @@ public class Slot {
 
     @Override
     public String toString() {
-        final StringBuilder sb = new StringBuilder("Slot{");
-        sb.append("num=").append(num);
-        sb.append(", ref=").append(ref);
-        sb.append('}');
-        return sb.toString();
+        return "Slot{" + "num=" + num + ", ref=" + ref + '}';
     }
 }