diff --git a/src/test/java/net/minestom/server/api/EnvImpl.java b/src/test/java/net/minestom/server/api/EnvImpl.java
index 4b37dccf6..9f03ce992 100644
--- a/src/test/java/net/minestom/server/api/EnvImpl.java
+++ b/src/test/java/net/minestom/server/api/EnvImpl.java
@@ -5,6 +5,7 @@ import net.minestom.server.event.Event;
 import net.minestom.server.event.EventFilter;
 import net.minestom.server.event.EventListener;
 import net.minestom.server.event.EventNode;
+import net.minestom.server.utils.PacketUtils;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.List;
@@ -51,6 +52,7 @@ final class EnvImpl implements Env {
     }
 
     void cleanup() {
+        PacketUtils.flush();
         this.listeners.forEach(FlexibleListenerImpl::check);
     }