diff --git a/src/org/jetbrains/jet/j2k/Converter.java b/src/org/jetbrains/jet/j2k/Converter.java
index b90a54e969d..b995b66a0d7 100644
--- a/src/org/jetbrains/jet/j2k/Converter.java
+++ b/src/org/jetbrains/jet/j2k/Converter.java
@@ -242,9 +242,7 @@ public class Converter {
     return tv.getPrimaryConstructor();
   }
 
-  public static boolean isConstructorPrimary(@Nullable PsiMethod constructor) {
-    if (constructor == null)
-      return false;
+  public static boolean isConstructorPrimary(@NotNull PsiMethod constructor) {
     if (constructor.getParent() instanceof PsiClass) {
       final PsiClass parent = (PsiClass) constructor.getParent();
       if (parent.getConstructors().length == 1)