diff --git a/ChangeLog b/ChangeLog
index 1565f06a84..905be7f93b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Dec 22 21:08:54 2008  Tanaka Akira  <akr@fsij.org>
+
+	* lib/test/unit/assertions.rb (assert_nothing_raised): increment
+	  assertion count.  [ruby-dev:37480]
+
 Mon Dec 22 19:10:44 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* thread_win32.c (Init_native_thread): need to call
diff --git a/lib/test/unit/assertions.rb b/lib/test/unit/assertions.rb
index 2c1f76e693..af1a23a3bc 100644
--- a/lib/test/unit/assertions.rb
+++ b/lib/test/unit/assertions.rb
@@ -15,6 +15,7 @@ module Test
       end
 
       def assert_nothing_raised(*args)
+        self._assertions += 1
         if Module === args.last
           msg = nil
         else