2 files changed, 3 insertions, 3 deletions
diff --git a/gc.c b/gc.c
index 311f66d2..0c727ed4 100644
--- a/gc.c
+++ b/gc.c
@@ -606,7 +606,7 @@ static int sweep_one(obj_t *block)
 #if CONFIG_GEN_GC
     block->t.gen = 1;
 #endif
-    block->t.type &= convert(type_t, ~REACHABLE);
+    block->t.type = convert(type_t, block->t.type & ~REACHABLE);
     return 0;
   }
 
diff --git a/gc.h b/gc.h
index 6103781a..a575ec88 100644
--- a/gc.h
+++ b/gc.h
@@ -66,8 +66,8 @@ extern val break_obj;
 #endif
 
 #define gc_hint(var) gc_hint_func(&var)
-#define REACHABLE 0x100
-#define FREE      0x200
+#define REACHABLE 0x100U
+#define FREE      0x200U
 
 INLINE val zap(volatile val *loc) { val ret = *loc; *loc = nil; return ret; }