diff --git a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/FilterCommandsTest.java b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/FilterCommandsTest.java
index 0d3181125..8dfdd0fc7 100644
--- a/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/FilterCommandsTest.java
+++ b/org.eclipse.jgit.test/tst/org/eclipse/jgit/util/FilterCommandsTest.java
@@ -85,6 +85,8 @@ public class FilterCommandsTest extends RepositoryTestCase {
 				public int run() throws IOException {
 					int b = in.read();
 					if (b == -1) {
+						in.close();
+						out.close();
 						return b;
 					}
 					out.write(prefix);