diff --git a/core/src/test/java/com/linecorp/armeria/server/ServerBuilderTest.java b/core/src/test/java/com/linecorp/armeria/server/ServerBuilderTest.java
index 11912c93a7c..87ad5abfbc8 100644
--- a/core/src/test/java/com/linecorp/armeria/server/ServerBuilderTest.java
+++ b/core/src/test/java/com/linecorp/armeria/server/ServerBuilderTest.java
@@ -37,6 +37,7 @@
 import java.util.function.Supplier;
 
 import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
@@ -143,6 +144,13 @@ private static Server newServerWithKeepAlive(long idleTimeoutMillis, long pingIn
                      .build();
     }
 
+    @AfterEach
+    void tearDown() {
+        poppedRouterCnt.set(0);
+        poppedRouterCnt2.set(0);
+        poppedCnt.set(0);
+    }
+
     @Test
     void acceptDuplicatePort() throws Exception {
         final Server server = Server.builder()