diff --git a/ChangeLog b/ChangeLog
index 9db37c2289..ce8676a3b7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,15 @@
+Thu Apr 14 14:28:55 2016  cremno phobia  <cremno@mail.ru>
+
+	* cont.c (fiber_initialize_machine_stack_context): fix wrong
+	  _MSC_VER check, should be decimal but not hexadecimal.
+	  [ruby-core:74936] [Bug #12279]
+
+Thu Apr 14 13:47:52 2016  cremno phobia  <cremno@mail.ru>
+
+	* cont.c (fiber_initialize_machine_stack_context): fix wrong
+	  _MSC_VER check, should be decimal but not hexadecimal.
+	  [ruby-core:74936] [Bug #12279]
+
 Wed Apr 13 22:51:38 2016  Tanaka Akira  <akr@fsij.org>
 
 	* array.c (rb_ary_sum): Array#sum is implemented.
diff --git a/cont.c b/cont.c
index 8ebd78f860..729a025fb0 100644
--- a/cont.c
+++ b/cont.c
@@ -657,7 +657,7 @@ fiber_initialize_machine_stack_context(rb_fiber_t *fib, size_t size)
     rb_thread_t *sth = &fib->cont.saved_thread;
 
 #ifdef _WIN32
-# if defined(_MSC_VER) && _MSC_VER <= 0x1200
+# if defined(_MSC_VER) && _MSC_VER <= 1200
 #   define CreateFiberEx(cs, stacksize, flags, entry, param) \
     CreateFiber((stacksize), (entry), (param))
 # endif