diff --git a/apache-rat-core/src/test/java/org/apache/rat/document/impl/guesser/BinaryGuesserTest.java b/apache-rat-core/src/test/java/org/apache/rat/document/impl/guesser/BinaryGuesserTest.java
index a5edbd4..0522a8b 100644
--- a/apache-rat-core/src/test/java/org/apache/rat/document/impl/guesser/BinaryGuesserTest.java
+++ b/apache-rat-core/src/test/java/org/apache/rat/document/impl/guesser/BinaryGuesserTest.java
@@ -90,7 +90,7 @@
                 r.close();
             }
             r = null;
-            assertTrue(BinaryGuesser.isBinary(doc));
+            assertTrue("Expected binary for "+ doc.getName(),BinaryGuesser.isBinary(doc));
         } finally {
             if (r != null) {
                 r.close();