diff --git a/java/java-psi-api/src/com/intellij/psi/PsiNameHelper.java b/java/java-psi-api/src/com/intellij/psi/PsiNameHelper.java
index 216e00864652..be0712efa5bc 100644
--- a/java/java-psi-api/src/com/intellij/psi/PsiNameHelper.java
+++ b/java/java-psi-api/src/com/intellij/psi/PsiNameHelper.java
@@ -127,6 +127,7 @@ public abstract class PsiNameHelper {
     return referenceName != null ? referenceName : "";
   }
 
+  @NotNull
   public static String getQualifiedClassName(String referenceText, boolean removeWhitespace) {
     if (removeWhitespace) {
       referenceText = removeWhitespace(referenceText);