diff --git a/services/src/main/java/io/scalecube/services/Microservices.java b/services/src/main/java/io/scalecube/services/Microservices.java
index 8fe291278..522ebb1ed 100644
--- a/services/src/main/java/io/scalecube/services/Microservices.java
+++ b/services/src/main/java/io/scalecube/services/Microservices.java
@@ -539,7 +539,7 @@ public <T, R> Context defaultPrincipalMapper(
     }
 
     private Context conclude() {
-      if (isConcluded.compareAndSet(false, true)) {
+      if (!isConcluded.compareAndSet(false, true)) {
         throw new IllegalStateException("Context is already concluded");
       }