diff --git a/ChangeLog b/ChangeLog
index 2fe565b730..894f4c1f61 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Apr 24 05:38:01 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (gc_mark_roots): fox to work PRINT_ROOT_TICKS.
+
 Fri Apr 24 04:49:05 2015  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* win32/Makefile.sub: MSVC14 have struct timespec.
diff --git a/gc.c b/gc.c
index 6b8cd7e0e9..f91d1e3c7a 100644
--- a/gc.c
+++ b/gc.c
@@ -154,7 +154,7 @@ rb_gc_guarded_ptr_val(volatile VALUE *ptr, VALUE val)
 #define PRINT_ROOT_TICKS 0
 #endif
 
-#define USE_TICK_T                 (PRINT_ENTER_EXIT_TICK || PRINT_MEASURE_LINE)
+#define USE_TICK_T                 (PRINT_ENTER_EXIT_TICK || PRINT_MEASURE_LINE || PRINT_ROOT_TICKS)
 #define TICK_TYPE 1
 
 typedef struct {
@@ -4471,11 +4471,6 @@ gc_mark_roots(rb_objspace_t *objspace, const char **categoryp)
 {
     struct gc_list *list;
     rb_thread_t *th = GET_THREAD();
-    if (categoryp) *categoryp = "xxx";
-
-#if USE_RGENGC
-    objspace->rgengc.parent_object = Qfalse;
-#endif
 
 #if PRINT_ROOT_TICKS
     tick_t start_tick = tick();
@@ -4487,6 +4482,12 @@ gc_mark_roots(rb_objspace_t *objspace, const char **categoryp)
     }
 #endif
 
+    if (categoryp) *categoryp = "xxx";
+
+#if USE_RGENGC
+    objspace->rgengc.parent_object = Qfalse;
+#endif
+
 #if PRINT_ROOT_TICKS
 #define MARK_CHECKPOINT_PRINT_TICK(category) do { \
     if (prev_category) { \