diff --git a/jps/jps-builders/src/org/jetbrains/jps/incremental/java/JavaBuilder.java b/jps/jps-builders/src/org/jetbrains/jps/incremental/java/JavaBuilder.java
index 1537bec04a12..6eb4eaf4b9e4 100644
--- a/jps/jps-builders/src/org/jetbrains/jps/incremental/java/JavaBuilder.java
+++ b/jps/jps-builders/src/org/jetbrains/jps/incremental/java/JavaBuilder.java
@@ -173,6 +173,7 @@ public class JavaBuilder extends ModuleLevelBuilder {
 
   @Override
   public void buildFinished(CompileContext context) {
+    myRefRegistrars.clear();
     final ConcurrentMap<String, Collection<String>> stats = COMPILER_USAGE_STATISTICS.get(context);
     if (stats.size() == 1) {
       final Map.Entry<String, Collection<String>> entry = stats.entrySet().iterator().next();