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-rw-r--r--include/ruby/encoding.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/ruby/encoding.h b/include/ruby/encoding.h
index 5b3ef484f5..e6ceb19cdf 100644
--- a/include/ruby/encoding.h
+++ b/include/ruby/encoding.h
@@ -20,6 +20,7 @@ extern "C" {
#endif
#include <stdarg.h>
+#include "ruby/ruby.h"
#include "ruby/oniguruma.h"
RUBY_SYMBOL_EXPORT_BEGIN