diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/AnnotationCodegen.java b/compiler/backend/src/org/jetbrains/jet/codegen/AnnotationCodegen.java
index b09d5034a34..2a575eee2b5 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/AnnotationCodegen.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/AnnotationCodegen.java
@@ -17,6 +17,7 @@
 package org.jetbrains.jet.codegen;
 
 import com.intellij.psi.PsiElement;
+import org.jetbrains.annotations.Nullable;
 import org.jetbrains.asm4.AnnotationVisitor;
 import org.jetbrains.asm4.ClassVisitor;
 import org.jetbrains.asm4.FieldVisitor;
@@ -135,7 +136,7 @@ public abstract class AnnotationCodegen {
         }
     }
 
-    private void genAnnotationExpressionValue(AnnotationVisitor annotationVisitor, String keyName, JetExpression expression) {
+    private void genAnnotationExpressionValue(AnnotationVisitor annotationVisitor, @Nullable String keyName, JetExpression expression) {
         CompileTimeConstant<?> compileTimeConstant =
                 bindingContext.get(BindingContext.COMPILE_TIME_VALUE, expression);
 
diff --git a/compiler/backend/src/org/jetbrains/jet/codegen/ClassBuilder.java b/compiler/backend/src/org/jetbrains/jet/codegen/ClassBuilder.java
index 82818e8533a..af635c6607d 100644
--- a/compiler/backend/src/org/jetbrains/jet/codegen/ClassBuilder.java
+++ b/compiler/backend/src/org/jetbrains/jet/codegen/ClassBuilder.java
@@ -88,7 +88,7 @@ public abstract class ClassBuilder {
         getVisitor().visitSource(name, debug);
     }
 
-    public void visitOuterClass(String owner, String name, String desc) {
+    public void visitOuterClass(String owner, @Nullable String name, @Nullable String desc) {
         getVisitor().visitOuterClass(owner, name, desc);
     }