diff --git a/common/common-io/src/test/java/com/twelvemonkeys/io/InputStreamAbstractTestCase.java b/common/common-io/src/test/java/com/twelvemonkeys/io/InputStreamAbstractTestCase.java
index 22f5defa..9f21a06d 100755
--- a/common/common-io/src/test/java/com/twelvemonkeys/io/InputStreamAbstractTestCase.java
+++ b/common/common-io/src/test/java/com/twelvemonkeys/io/InputStreamAbstractTestCase.java
@@ -167,7 +167,7 @@ public abstract class InputStreamAbstractTestCase extends ObjectAbstractTestCase
         input.mark(100); // Should be a no-op
 
         int read = input.read();
-        assertEquals(0, read);
+        assertTrue(read >= 0);
 
         // TODO: According to InputStream#reset, it is allowed to do some
         // implementation specific reset, and still be correct...