diff --git a/dew-common/src/dev/shiza/dew/result/ResultProcessorFacade.java b/dew-common/src/dev/shiza/dew/result/ResultProcessorFacade.java
index 9ba327e..5818f71 100644
--- a/dew-common/src/dev/shiza/dew/result/ResultProcessorFacade.java
+++ b/dew-common/src/dev/shiza/dew/result/ResultProcessorFacade.java
@@ -4,7 +4,7 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-public interface ResultProcessorFacade {
+public sealed interface ResultProcessorFacade permits ResultProcessorService {
 
   <E extends Event, T> void tryProcessing(final @NotNull E event, final @Nullable T value);
 }