diff --git a/ChangeLog b/ChangeLog
index d5bbad50fb..0ba325ec68 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Nov  5 04:03:07 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (GC_MALLOC_LIMIT_MAX): fix default value 512MB -> 384MB.
+	  512MB is huge.
+
 Tue Nov  5 03:31:23 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c: add 3gen GC patch, but disabled as default.
diff --git a/gc.c b/gc.c
index e8f504f7b6..a5671f570c 100644
--- a/gc.c
+++ b/gc.c
@@ -93,7 +93,7 @@ rb_gc_guarded_ptr(volatile VALUE *ptr)
 #define GC_MALLOC_LIMIT (16 /* 16 MB */ * 1024 * 1024 /* 1MB */)
 #endif
 #ifndef GC_MALLOC_LIMIT_MAX
-#define GC_MALLOC_LIMIT_MAX (512 /* 512 MB */ * 1024 * 1024 /* 1MB */)
+#define GC_MALLOC_LIMIT_MAX (384 /* 384 MB */ * 1024 * 1024 /* 1MB */)
 #endif
 #ifndef GC_MALLOC_LIMIT_GROWTH_FACTOR
 #define GC_MALLOC_LIMIT_GROWTH_FACTOR 2.0