1 files changed, 2 insertions, 2 deletions
diff --git a/gc.c b/gc.c
index 7a2ae7decf..ca3862f0b4 100644
--- a/gc.c
+++ b/gc.c
@@ -1256,8 +1256,8 @@ obj_free(obj)
 	break;
 
       default:
-	rb_bug("gc_sweep(): unknown data type 0x%lx(%ld)", obj,
-	       RANY(obj)->as.basic.flags & T_MASK);
+	rb_bug("gc_sweep(): unknown data type 0x%lx(0x%lx)",
+	       RANY(obj)->as.basic.flags & T_MASK, obj);
     }
 }