diff --git a/junit/src/org/netbeans/modules/junit/output/JUnitOutputReader.java b/junit/src/org/netbeans/modules/junit/output/JUnitOutputReader.java
--- a/junit/src/org/netbeans/modules/junit/output/JUnitOutputReader.java
+++ b/junit/src/org/netbeans/modules/junit/output/JUnitOutputReader.java
@@ -553,6 +553,7 @@
                 if ((reportFile != null) && isValidReportFile(reportFile)) {
                     JUnitTestSuite reportSuite = parseReportFile(reportFile);
                     if ((reportSuite != null) && (reportSuite.getName().equals(currentSuite.getName()))) {
+                        deleteReportFile(reportFile); // #171050
                         lastSuiteTime = reportSuite.getElapsedTime();
                         for(Testcase tc: currentSuite.getTestcases()){
                             if (!tc.getOutput().isEmpty()){
@@ -739,6 +740,23 @@
             return false;
         }
     }
+
+    private void deleteReportFile(File reportFile) {
+        try {
+            reportFile = FileUtil.normalizeFile(reportFile);
+            String reportPath = reportFile.getAbsolutePath();
+            reportPath = reportPath.replace('\\', '/');
+            String projectPath =
+                    testSession.getProject().getProjectDirectory().getPath();
+            if (reportPath.startsWith(projectPath)) {
+                // we won't delete not temporary report located in project
+                return;
+            }
+            reportFile.delete();
+        } catch (Exception e) {
+            // do nothing
+        }
+    }
     
     private File findReportFile() {
         File file = new File(resultsDir,