diff --git a/idea/src/org/jetbrains/jet/plugin/codeInsight/ktSignature/AddKotlinSignatureAnnotation.java b/idea/src/org/jetbrains/jet/plugin/codeInsight/ktSignature/AddKotlinSignatureAnnotation.java
index 714d77f45d0..618dfe87a6e 100644
--- a/idea/src/org/jetbrains/jet/plugin/codeInsight/ktSignature/AddKotlinSignatureAnnotation.java
+++ b/idea/src/org/jetbrains/jet/plugin/codeInsight/ktSignature/AddKotlinSignatureAnnotation.java
@@ -151,6 +151,7 @@ public class AddKotlinSignatureAnnotation extends BaseIntentionAction implements
         PsiElement element = file.findElementAt(offset);
         PsiMethod res = PsiTreeUtil.getParentOfType(element, PsiMethod.class);
         if (res == null) return null;
+        if (res.getReturnType() == null) return null; // disabled for constructors
 
         //Not available in method's body
         PsiCodeBlock body = res.getBody();