diff --git a/test/lib/test/unit/assertions.rb b/test/lib/test/unit/assertions.rb
index dd4e0fccf0..3cbf32882e 100644
--- a/test/lib/test/unit/assertions.rb
+++ b/test/lib/test/unit/assertions.rb
@@ -186,7 +186,6 @@ module Test
             raise
           end
         end
-        nil
       end
 
       # :call-seq: