diff --git a/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/ExpressionTypingServices.java b/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/ExpressionTypingServices.java
index f389156dd7a..6426ee5d2e2 100644
--- a/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/ExpressionTypingServices.java
+++ b/compiler/frontend/src/org/jetbrains/kotlin/types/expressions/ExpressionTypingServices.java
@@ -49,7 +49,7 @@ public class ExpressionTypingServices {
     private final ExpressionTypingFacade expressionTypingFacade;
     private final ExpressionTypingComponents expressionTypingComponents;
 
-    @NotNull AnnotationChecker annotationChecker;
+    @NotNull private final AnnotationChecker annotationChecker;
     @NotNull private final StatementFilter statementFilter;
 
     public ExpressionTypingServices(