diff --git a/ChangeLog b/ChangeLog
index 98861c8b73..e913ff96ed 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Mar  1 19:06:47 2014  Eric Wong  <e@80x24.org>
+
+	* gc.c (ruby_gc_set_params): simplify condition
+
 Sat Mar  1 16:18:40 2014  Tanaka Akira  <akr@fsij.org>
 
 	* ext/readline/readline.c (Init_readline): Use rl_hook_func_t instead
@@ -5,7 +9,7 @@ Sat Mar  1 16:18:40 2014  Tanaka Akira  <akr@fsij.org>
 	  since readline-4.2.)
 	  Reported by Dmitry Medvinsky.  [ruby-core:61141] [Bug #9578]
 
-Sat Mar 1 16:05:58 2014  Eric Wong  <e@80x24.org>
+Sat Mar  1 16:05:58 2014  Eric Wong  <e@80x24.org>
 
 	* gc.c (ruby_gc_set_params): fix building without RGenGC
 
diff --git a/gc.c b/gc.c
index a677370e6b..9a6a8c7eef 100644
--- a/gc.c
+++ b/gc.c
@@ -5827,7 +5827,7 @@ ruby_gc_set_params(int safe_level)
     get_envparam_size  ("RUBY_GC_MALLOC_LIMIT_MAX", &gc_params.malloc_limit_max, 0);
     get_envparam_double("RUBY_GC_MALLOC_LIMIT_GROWTH_FACTOR", &gc_params.malloc_limit_growth_factor, 1.0);
 
-#if (USE_RGENGC) && defined(RGENGC_ESTIMATE_OLDMALLOC)
+#if RGENGC_ESTIMATE_OLDMALLOC
     if (get_envparam_size("RUBY_GC_OLDMALLOC_LIMIT", &gc_params.oldmalloc_limit_min, 0)) {
 	rb_objspace_t *objspace = &rb_objspace;
 	objspace->rgengc.oldmalloc_increase_limit = gc_params.oldmalloc_limit_min;