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-rw-r--r--include/mruby.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/mruby.h b/include/mruby.h
index a9027d896..1124ba89c 100644
--- a/include/mruby.h
+++ b/include/mruby.h
@@ -81,7 +81,7 @@ typedef struct mrb_value {
#define mrb_symbol(o) (o).value.sym
#define mrb_object(o) ((struct RBasic *) (o).value.p)
#define FIXNUM_P(o) ((o).tt == MRB_TT_FIXNUM)
-#define UNDEF_P(o) ((o).tt == MRB_TT_UNDEF)
+#define mrb_undef_p(o) ((o).tt == MRB_TT_UNDEF)
#include "mruby/object.h"