diff --git a/src/test/java/org/apache/commons/collections4/bloomfilter/IndexProducerFromBitmapProducerTest.java b/src/test/java/org/apache/commons/collections4/bloomfilter/IndexProducerFromBitmapProducerTest.java
index c4c5689b3..f048ba35c 100644
--- a/src/test/java/org/apache/commons/collections4/bloomfilter/IndexProducerFromBitmapProducerTest.java
+++ b/src/test/java/org/apache/commons/collections4/bloomfilter/IndexProducerFromBitmapProducerTest.java
@@ -84,7 +84,7 @@ public class IndexProducerFromBitmapProducerTest extends AbstractIndexProducerTe
         }
     }
 
-    private class TestingBitMapProducer implements BitMapProducer {
+    private static class TestingBitMapProducer implements BitMapProducer {
         long[] values;
 
         TestingBitMapProducer(final long[] values) {
diff --git a/src/test/java/org/apache/commons/collections4/bloomfilter/IndexProducerTest.java b/src/test/java/org/apache/commons/collections4/bloomfilter/IndexProducerTest.java
index 791856504..52f557a83 100644
--- a/src/test/java/org/apache/commons/collections4/bloomfilter/IndexProducerTest.java
+++ b/src/test/java/org/apache/commons/collections4/bloomfilter/IndexProducerTest.java
@@ -51,7 +51,7 @@ public class IndexProducerTest {
         }
     }
 
-    private class TestingBitMapProducer implements BitMapProducer {
+    private static class TestingBitMapProducer implements BitMapProducer {
         long[] values;
 
         TestingBitMapProducer(final long[] values) {