diff --git a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/WriteThroughScope.java b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/WriteThroughScope.java
index 17af13ce3dd..81bc6a6bb6d 100644
--- a/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/WriteThroughScope.java
+++ b/compiler/frontend/src/org/jetbrains/jet/lang/resolve/scopes/WriteThroughScope.java
@@ -47,7 +47,7 @@ public class WriteThroughScope extends WritableScopeWithImports {
 
     @Override
     @NotNull
-    public Collection<DeclarationDescriptor> getDeclarationsByLabel(LabelName labelName) {
+    public Collection<DeclarationDescriptor> getDeclarationsByLabel(@NotNull LabelName labelName) {
         checkMayRead();
 
         return writableWorker.getDeclarationsByLabel(labelName);
diff --git a/core/descriptor.loader.java/src/org/jetbrains/jet/lang/resolve/java/scope/JavaClassMembersScope.java b/core/descriptor.loader.java/src/org/jetbrains/jet/lang/resolve/java/scope/JavaClassMembersScope.java
index 991076daa59..d8eee2edca4 100644
--- a/core/descriptor.loader.java/src/org/jetbrains/jet/lang/resolve/java/scope/JavaClassMembersScope.java
+++ b/core/descriptor.loader.java/src/org/jetbrains/jet/lang/resolve/java/scope/JavaClassMembersScope.java
@@ -37,7 +37,7 @@ public abstract class JavaClassMembersScope extends JavaBaseScope {
 
     @NotNull
     @Override
-    public Collection<DeclarationDescriptor> getDeclarationsByLabel(LabelName labelName) {
+    public Collection<DeclarationDescriptor> getDeclarationsByLabel(@NotNull LabelName labelName) {
         throw new UnsupportedOperationException(); // TODO
     }
 
diff --git a/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/AbstractScopeAdapter.java b/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/AbstractScopeAdapter.java
index d6d8448585a..70b6fa454b4 100644
--- a/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/AbstractScopeAdapter.java
+++ b/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/AbstractScopeAdapter.java
@@ -74,7 +74,7 @@ public abstract class AbstractScopeAdapter implements JetScope {
 
     @NotNull
     @Override
-    public Collection<DeclarationDescriptor> getDeclarationsByLabel(LabelName labelName) {
+    public Collection<DeclarationDescriptor> getDeclarationsByLabel(@NotNull LabelName labelName) {
         return getWorkerScope().getDeclarationsByLabel(labelName);
     }
 
diff --git a/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/InnerClassesScopeWrapper.java b/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/InnerClassesScopeWrapper.java
index 90ac6d9c532..9ca0810b3b9 100644
--- a/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/InnerClassesScopeWrapper.java
+++ b/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/InnerClassesScopeWrapper.java
@@ -54,7 +54,7 @@ public class InnerClassesScopeWrapper extends AbstractScopeAdapter {
 
     @NotNull
     @Override
-    public Collection<DeclarationDescriptor> getDeclarationsByLabel(LabelName labelName) {
+    public Collection<DeclarationDescriptor> getDeclarationsByLabel(@NotNull LabelName labelName) {
         return Collections2.filter(actualScope.getDeclarationsByLabel(labelName), IS_CLASS);
     }
 
diff --git a/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeImpl.java b/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeImpl.java
index 2e4d883e616..ed9512ff3ea 100644
--- a/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeImpl.java
+++ b/core/descriptors/src/org/jetbrains/jet/lang/resolve/scopes/JetScopeImpl.java
@@ -59,7 +59,7 @@ public abstract class JetScopeImpl implements JetScope {
 
     @NotNull
     @Override
-    public Collection<DeclarationDescriptor> getDeclarationsByLabel(LabelName labelName) {
+    public Collection<DeclarationDescriptor> getDeclarationsByLabel(@NotNull LabelName labelName) {
         return Collections.emptyList();
     }