diff --git a/lucene/facet/src/java/org/apache/lucene/facet/search/FacetsCollector.java b/lucene/facet/src/java/org/apache/lucene/facet/search/FacetsCollector.java
index f27d3e2..4946330 100644
--- a/lucene/facet/src/java/org/apache/lucene/facet/search/FacetsCollector.java
+++ b/lucene/facet/src/java/org/apache/lucene/facet/search/FacetsCollector.java
@@ -91,7 +91,7 @@ public abstract class FacetsCollector extends Collector {
       if (bits != null) {
         matchingDocs.add(new MatchingDocs(this.context, bits, totalHits, scores));
       }
-      bits = new FixedBitSet(context.reader().maxDoc());
+      bits = createBitSet(context.reader().maxDoc());
       totalHits = 0;
       scores = new float[64]; // some initial size
       this.context = context;
@@ -137,7 +137,7 @@ public abstract class FacetsCollector extends Collector {
       if (bits != null) {
         matchingDocs.add(new MatchingDocs(this.context, bits, totalHits, null));
       }
-      bits = new FixedBitSet(context.reader().maxDoc());
+      bits = createBitSet(context.reader().maxDoc());
       totalHits = 0;
       this.context = context;
     }
@@ -191,6 +191,10 @@ public abstract class FacetsCollector extends Collector {
     this.accumulator = accumulator;
   }
   
+  protected FixedBitSet createBitSet(int maxDoc) {
+    return new FixedBitSet(maxDoc);
+  }
+  
   /**
    * Called when the Collector has finished, so that the last
    * {@link MatchingDocs} can be added.