diff --git a/ChangeLog b/ChangeLog
index 63fd388fb2..9ba9221a08 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Sun Nov 10 01:34:14 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (vm_malloc_increase): sweep immediately on GC due to malloc().
+	  To reduce memory usage, sweep as soon as possible.
+	  This behavior is same as Ruby 2.0.0 and before.
+
 Sun Nov 10 00:39:26 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* benchmark/gc/gcbench.rb: output version description and GC::OPTS.
diff --git a/gc.c b/gc.c
index dda3292b60..4b0fb1c0a3 100644
--- a/gc.c
+++ b/gc.c
@@ -5449,7 +5449,7 @@ vm_malloc_increase(rb_objspace_t *objspace, size_t new_size, size_t old_size, in
 
     if (do_gc) {
 	if (ruby_gc_stress && !ruby_disable_gc_stress) {
-	    garbage_collect_with_gvl(objspace, 0, 0, GPR_FLAG_MALLOC);
+	    garbage_collect_with_gvl(objspace, FALSE, TRUE, GPR_FLAG_MALLOC);
 	}
 	else {
 	  retry:
@@ -5458,7 +5458,7 @@ vm_malloc_increase(rb_objspace_t *objspace, size_t new_size, size_t old_size, in
 		    gc_rest_sweep(objspace); /* rest_sweep can reduce malloc_increase */
 		    goto retry;
 		}
-		garbage_collect_with_gvl(objspace, 0, 0, GPR_FLAG_MALLOC);
+		garbage_collect_with_gvl(objspace, FALSE, TRUE, GPR_FLAG_MALLOC);
 	    }
 	}
     }