diff --git a/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/LauncherSupport.java b/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/LauncherSupport.java
index 65335dc033..e3138001a1 100644
--- a/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/LauncherSupport.java
+++ b/src/main/org/apache/tools/ant/taskdefs/optional/junitlauncher/LauncherSupport.java
@@ -45,6 +45,7 @@
 import org.junit.platform.launcher.listeners.SummaryGeneratingListener;
 import org.junit.platform.launcher.listeners.TestExecutionSummary;
 
+import java.io.BufferedOutputStream;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
@@ -257,7 +258,7 @@ private void setupResultFormatter(final TestRequest testRequest, final ListenerD
         // set the destination output stream for writing out the formatted result
         final java.nio.file.Path resultOutputFile = getListenerOutputFile(testRequest, formatterDefinition);
         try {
-            final OutputStream resultOutputStream = Files.newOutputStream(resultOutputFile);
+            final OutputStream resultOutputStream = new BufferedOutputStream(Files.newOutputStream(resultOutputFile));
             // enroll the output stream to be closed when the execution of the TestRequest completes
             testRequest.closeUponCompletion(resultOutputStream);
             resultFormatter.setDestination(new KeepAliveOutputStream(resultOutputStream));