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-rw-r--r--include/ruby/ruby.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index ff6c708ba9..8171ab3e32 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -1728,7 +1728,7 @@ int ruby_native_thread_p(void);
#define RUBY_INTERNAL_EVENT_OBJSPACE_MASK 0x7f00000
#define RUBY_INTERNAL_EVENT_MASK 0xfffe0000
-typedef unsigned long rb_event_flag_t;
+typedef uint32_t rb_event_flag_t;
typedef void (*rb_event_hook_func_t)(rb_event_flag_t evflag, VALUE data, VALUE self, ID mid, VALUE klass);
#define RB_EVENT_HOOKS_HAVE_CALLBACK_DATA 1