diff --git a/ChangeLog b/ChangeLog
index 1d629fd780..5bee6dbcf9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Wed Dec 19 21:14:28 2012  Narihiro Nakamura  <authornari@gmail.com>
+
+	* gc.c: return true or false. Patch by Dirkjan Bussink. [Bug #6821]
+
+	* test/ruby/test_gc.rb: add test-case for this bug.
+
 Wed Dec 19 21:12:49 2012  Shugo Maeda  <shugo@ruby-lang.org>
 
 	* marshal.c (r_entry0): don't taint classes and modules because
diff --git a/gc.c b/gc.c
index 01d908d1b7..1d37e0ceb4 100644
--- a/gc.c
+++ b/gc.c
@@ -627,7 +627,7 @@ static VALUE
 gc_profile_enable_get(VALUE self)
 {
     rb_objspace_t *objspace = &rb_objspace;
-    return objspace->profile.run;
+    return objspace->profile.run ? Qtrue : Qfalse;
 }
 
 /*
diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index bcc490626d..63bec82aad 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -97,4 +97,13 @@ class TestGc < Test::Unit::TestCase
     assert_in_out_err([env, "-W1", "-e", "exit"], "", [], [], "[ruby-core:39795]")
     assert_in_out_err([env, "-w", "-e", "exit"], "", [], /heap_min_slots=100000/, "[ruby-core:39795]")
   end
+
+  def test_profiler_enabled
+    GC::Profiler.enable
+    assert_equal(true, GC::Profiler.enabled?)
+    GC::Profiler.disable
+    assert_equal(false, GC::Profiler.enabled?)
+  ensure
+    GC::Profiler.disable
+  end
 end
diff --git a/version.h b/version.h
index afaae0cc4e..b803415eb7 100644
--- a/version.h
+++ b/version.h
@@ -1,5 +1,5 @@
 #define RUBY_VERSION "1.9.3"
-#define RUBY_PATCHLEVEL 342
+#define RUBY_PATCHLEVEL 343
 
 #define RUBY_RELEASE_DATE "2012-12-19"
 #define RUBY_RELEASE_YEAR 2012