diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerDeclarationTranslator.java b/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerDeclarationTranslator.java
index 518caa74661..c6c790b8bd8 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerDeclarationTranslator.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerDeclarationTranslator.java
@@ -39,6 +39,7 @@ abstract class InnerDeclarationTranslator {
         this.fun = fun;
     }
 
+    @NotNull
     public JsExpression translate(@NotNull JsNameRef nameRef, @Nullable JsExpression self) {
         UsageTracker usageTracker = context.usageTracker();
         assert usageTracker != null : "Usage tracker should not be null for InnerDeclarationTranslator";
@@ -72,7 +73,9 @@ abstract class InnerDeclarationTranslator {
         return invocation;
     }
 
+    @NotNull
     protected abstract JsExpression createExpression(@NotNull JsNameRef nameRef, @Nullable JsExpression self);
 
+    @NotNull
     protected abstract JsInvocation createInvocation(@NotNull JsNameRef nameRef, @Nullable JsExpression self);
 }
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerFunctionTranslator.java b/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerFunctionTranslator.java
index d6892bb2231..c451c2d10da 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerFunctionTranslator.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerFunctionTranslator.java
@@ -43,11 +43,13 @@ class InnerFunctionTranslator extends InnerDeclarationTranslator {
     }
 
     @Override
+    @NotNull
     protected JsExpression createExpression(@NotNull JsNameRef nameRef, @Nullable JsExpression self) {
         return nameRef;
     }
 
     @Override
+    @NotNull
     protected JsInvocation createInvocation(@NotNull JsNameRef nameRef, @Nullable JsExpression self) {
         return new JsInvocation(new JsNameRef("bind", nameRef), new SmartList<JsExpression>(self));
     }
diff --git a/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerObjectTranslator.java b/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerObjectTranslator.java
index f6a66769cb9..579d4890c16 100644
--- a/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerObjectTranslator.java
+++ b/js/js.translator/src/org/jetbrains/k2js/translate/expression/InnerObjectTranslator.java
@@ -30,11 +30,13 @@ class InnerObjectTranslator extends InnerDeclarationTranslator {
     }
 
     @Override
+    @NotNull
     protected JsExpression createExpression(@NotNull JsNameRef nameRef, @Nullable JsExpression self) {
         return createInvocation(nameRef, self);
     }
 
     @Override
+    @NotNull
     protected JsInvocation createInvocation(@NotNull JsNameRef nameRef, @Nullable JsExpression self) {
         JsInvocation invocation = new JsInvocation(nameRef);
         if (self != null) {