diff --git a/core/src/test/java/hudson/FilePathTest.java b/core/src/test/java/hudson/FilePathTest.java
index ddac863fb2749e0e248e099aeef04891a89573d5..56eb082c822149e62aeaebb7af197a87eb91d46e 100644
--- a/core/src/test/java/hudson/FilePathTest.java
+++ b/core/src/test/java/hudson/FilePathTest.java
@@ -77,9 +77,10 @@ public class FilePathTest extends TestCase {
     }
 
     public void testCopyTo() throws Exception {
-        File tmp = File.createTempFile("tmp","");
+        File tmp = File.createTempFile("testCopyTo","");
         FilePath f = new FilePath(french,tmp.getPath());
         f.copyTo(new NullStream());
+        tmp.delete();
     }
 
 }