diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/AbbreviationTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/AbbreviationTest.java
index a9edf73b8..14863488c 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/AbbreviationTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/AbbreviationTest.java
@@ -187,7 +187,10 @@ public class AbbreviationTest extends LocalDiskRepositoryTestCase {
 			PackIndexWriter writer = new PackIndexWriterV2(dst);
 			writer.write(objects, new byte[OBJECT_ID_LENGTH]);
 		}
-		new FileOutputStream(packFile).close();
+
+		try (FileOutputStream unused = new FileOutputStream(packFile)) {
+			// unused
+		}
 
 		assertEquals(id.abbreviate(20), reader.abbreviate(id, 2));