diff --git a/ChangeLog b/ChangeLog
index 3130d8554f..f552aa66fa 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Apr 12 03:50:44 2012  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* lib/test/unit.rb (Test::Unit:Runner::Worker#_run_suites):
+	  call GC.start before running the test suites.
+
 Wed Apr 11 22:31:19 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* parse.y (rb_check_id_cstr): new function to check if ID is
diff --git a/lib/test/unit.rb b/lib/test/unit.rb
index 8551d9e238..311d758a81 100644
--- a/lib/test/unit.rb
+++ b/lib/test/unit.rb
@@ -624,6 +624,7 @@ module Test
       def _run_suites suites, type
         @interrupt = nil
         result = []
+        GC.start
         if @options[:parallel]
           _run_parallel suites, type, result
         else