diff --git a/hyracks-fullstack/hyracks/hyracks-test-support/src/main/java/org/apache/hyracks/test/support/LicensingTestBase.java b/hyracks-fullstack/hyracks/hyracks-test-support/src/main/java/org/apache/hyracks/test/support/LicensingTestBase.java
index 283c12c..6588f5f 100644
--- a/hyracks-fullstack/hyracks/hyracks-test-support/src/main/java/org/apache/hyracks/test/support/LicensingTestBase.java
+++ b/hyracks-fullstack/hyracks/hyracks-test-support/src/main/java/org/apache/hyracks/test/support/LicensingTestBase.java
@@ -22,6 +22,7 @@
 import java.io.IOException;
 import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 
 import org.apache.commons.io.FileUtils;
@@ -46,7 +47,7 @@
             }
             installerDir = FileUtil.joinPath(targetDir, list[0], topLevel[0]);
             Assert.assertNotNull("installerDir", list);
-            Assert.assertFalse("Ambiguous install dir (" + pattern + "): " + list, list.length > 1);
+            Assert.assertFalse("Ambiguous install dir (" + pattern + "): " + Arrays.toString(list), list.length > 1);
             Assert.assertEquals("Can't find install dir (" + pattern + ")", 1, topLevel.length);
         }
     }