diff --git a/src/gc.c b/src/gc.c
index 768d091b6..ad491a30e 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -297,17 +297,6 @@ mrb_object_dead_p(mrb_state *mrb, struct RBasic *object)
   return is_dead(gc, object);
 }
 
-static void
-unlink_heap_page(mrb_gc *gc, mrb_heap_page *page)
-{
-  if (page->prev)
-    page->prev->next = page->next;
-  if (page->next)
-    page->next->prev = page->prev;
-  if (gc->heaps == page)
-    gc->heaps = page->next;
-}
-
 static void
 add_heap(mrb_state *mrb, mrb_gc *gc)
 {
@@ -1115,7 +1104,14 @@ incremental_sweep_phase(mrb_state *mrb, mrb_gc *gc, size_t limit)
     if (dead_slot) {
       mrb_heap_page *next = page->next;
 
-      unlink_heap_page(gc, page);
+      /* unlink_heap_page */
+      if (page->prev)
+        page->prev->next = page->next;
+      if (page->next)
+        page->next->prev = page->prev;
+      if (gc->heaps == page)
+        gc->heaps = page->next;
+
       mrb_free(mrb, page);
       page = next;
     }