diff --git a/platform/analysis-api/src/com/intellij/lang/annotation/Annotation.java b/platform/analysis-api/src/com/intellij/lang/annotation/Annotation.java
index 22c01a09228e..429022fb9970 100644
--- a/platform/analysis-api/src/com/intellij/lang/annotation/Annotation.java
+++ b/platform/analysis-api/src/com/intellij/lang/annotation/Annotation.java
@@ -40,7 +40,7 @@ import java.util.List;
  * @see AnnotationHolder
  * @see com.intellij.openapi.editor.markup.RangeHighlighter
  */
-public class Annotation implements Segment {
+public final class Annotation implements Segment {
   private final int myStartOffset;
   private final int myEndOffset;
   private final HighlightSeverity mySeverity;