1 files changed, 2 insertions, 2 deletions
diff --git a/error.c b/error.c
index 3b1a80755c..08f26ddd4a 100644
--- a/error.c
+++ b/error.c
@@ -148,8 +148,8 @@ rb_syntax_error_append(VALUE exc, VALUE file, int line, int column,
 }
 
 static unsigned int warning_disabled_categories = (
-    1U << RB_WARN_CATEGORY_DEPRECATED |
-    0);
+    (1U << RB_WARN_CATEGORY_DEPRECATED) |
+    ~RB_WARN_CATEGORY_ALL_BITS);
 
 static unsigned int
 rb_warning_category_mask(VALUE category)