1 files changed, 7 insertions, 1 deletions
diff --git a/method.h b/method.h
index dc430401a7..7c1ce3b8b3 100644
--- a/method.h
+++ b/method.h
@@ -32,10 +32,16 @@ typedef enum {
     METHOD_VISI_MASK = 0x03
 } rb_method_visibility_t;
 
+#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
+#define bits_t rb_method_visibility_t
+#else
+#define bits_t unsigned int
+#endif
 typedef struct rb_scope_visi_struct {
-    rb_method_visibility_t method_visi : 3;
+    bits_t method_visi : 3;
     unsigned int module_func : 1;
 } rb_scope_visibility_t;
+#undef bits_t
 
 /*! CREF (Class REFerence) */
 typedef struct rb_cref_struct {