diff --git a/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/directory/StaticDirectory.java b/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/directory/StaticDirectory.java
index 8a17dc0fc0..36e3d3eb59 100644
--- a/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/directory/StaticDirectory.java
+++ b/dubbo-cluster/src/main/java/org/apache/dubbo/rpc/cluster/directory/StaticDirectory.java
@@ -36,6 +36,7 @@ import static org.apache.dubbo.common.constants.LoggerCodeConstants.CLUSTER_FAIL
  */
 public class StaticDirectory<T> extends AbstractDirectory<T> {
     private static final ErrorTypeAwareLogger logger = LoggerFactory.getErrorTypeAwareLogger(StaticDirectory.class);
+    private final Class<T> interfaceClass;
 
     public StaticDirectory(List<Invoker<T>> invokers) {
         this(null, invokers, null);
@@ -55,11 +56,12 @@ public class StaticDirectory<T> extends AbstractDirectory<T> {
             throw new IllegalArgumentException("invokers == null");
         }
         this.setInvokers(new BitList<>(invokers));
+        this.interfaceClass = invokers.get(0).getInterface();
     }
 
     @Override
     public Class<T> getInterface() {
-        return getInvokers().get(0).getInterface();
+        return interfaceClass;
     }
 
     @Override