diff --git a/lib/test/unit/assertions.rb b/lib/test/unit/assertions.rb
index ae10e0bb7a..3ed3dc339e 100644
--- a/lib/test/unit/assertions.rb
+++ b/lib/test/unit/assertions.rb
@@ -98,7 +98,7 @@ module Test
           raise TypeError, "Expected #{expected.inspect} to be a kind of String or Regexp, not #{expected.class}"
         end
 
-        ex = assert_raise(exception, msg) {yield}
+        ex = assert_raise(exception, *msg) {yield}
         msg = message(msg, "") {"Expected Exception(#{exception}) was raised, but the message doesn't match"}
         __send__(assert, expected, ex.message, msg)
         ex