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-rw-r--r--include/ruby/3/attr/enum_extensibility.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/3/attr/enum_extensibility.h b/include/ruby/3/attr/enum_extensibility.h
index a56d1a54b8..15a5b063f2 100644
--- a/include/ruby/3/attr/enum_extensibility.h
+++ b/include/ruby/3/attr/enum_extensibility.h
@@ -20,6 +20,7 @@
* extension libraries. They could be written in C++98.
* @brief #RUBY3_ATTR_ENUM_EXTENSIBILITY.
*/
+#include "ruby/3/has/attribute.h"
/** Wraps (or simulates) `__attribute__((enum_extensibility))` */
#if RUBY3_HAS_ATTRIBUTE(enum_extensibility)