diff --git a/test/digest/test_digest.rb b/test/digest/test_digest.rb
old mode 100644
new mode 100755
index 1d1efa15eb..9f95afa1de
--- a/test/digest/test_digest.rb
+++ b/test/digest/test_digest.rb
@@ -59,7 +59,7 @@ module TestDigest
     md2 = self.class::ALGO.new
     md2 << "A"
 
-    assert(md1 != md2, self.class::ALGO)
+    assert_not_equal(md1, md2, self.class::ALGO)
 
     md2 << "BC"