diff --git a/src/gc.c b/src/gc.c
index 1468dd994..c0d4e1599 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -545,8 +545,6 @@ obj_free(mrb_state *mrb, struct RBasic *obj)
   obj->tt = MRB_TT_FREE;
 }
 
-#include <stdio.h>
-
 static void
 root_scan_phase(mrb_state *mrb)
 {