diff --git a/src/Lucene.Net.TestFramework/Store/MockDirectoryWrapper.cs b/src/Lucene.Net.TestFramework/Store/MockDirectoryWrapper.cs
index dc226fa691..0c756b4b7c 100644
--- a/src/Lucene.Net.TestFramework/Store/MockDirectoryWrapper.cs
+++ b/src/Lucene.Net.TestFramework/Store/MockDirectoryWrapper.cs
@@ -704,7 +704,7 @@ public override IndexOutput CreateOutput(string name, IOContext context)
                     {
                         if (existing != null)
                         {
-                            ramdir.m_sizeInBytes.AddAndGet(-existing.GetSizeInBytes()); // LUCENENET: GetAndAdd in Lucene, but we are not using the value
+                            ramdir.m_sizeInBytes.GetAndAdd(-existing.GetSizeInBytes());
                             existing.directory = null;
                         }
                         ramdir.m_fileMap[name] = file;
@@ -1558,4 +1558,4 @@ protected FakeIOException(SerializationInfo info, StreamingContext context)
         }
 #endif
     }
-}
\ No newline at end of file
+}
diff --git a/src/Lucene.Net.Tests/Search/TestBooleanOr.cs b/src/Lucene.Net.Tests/Search/TestBooleanOr.cs
index 74971e4288..243be1e397 100644
--- a/src/Lucene.Net.Tests/Search/TestBooleanOr.cs
+++ b/src/Lucene.Net.Tests/Search/TestBooleanOr.cs
@@ -205,7 +205,7 @@ public virtual void TestBooleanScorerMax()
             while (end.Value < docCount)
             {
                 int inc = TestUtil.NextInt32(Random, 1, 1000);
-                end.AddAndGet(inc);
+                end.GetAndAdd(inc);
                 scorer.Score(c, end);
             }