1 files changed, 1 insertions, 1 deletions
diff --git a/src/gc.c b/src/gc.c
index 417375b34..4c50b11da 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -585,7 +585,7 @@ gc_mark_children(mrb_state *mrb, struct RBasic *obj)
   }
 }
 
-void
+MRB_API void
 mrb_gc_mark(mrb_state *mrb, struct RBasic *obj)
 {
   if (obj == 0) return;