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-rw-r--r--internal/serial.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/internal/serial.h b/internal/serial.h
index 518cef4e93..021f201e0b 100644
--- a/internal/serial.h
+++ b/internal/serial.h
@@ -9,7 +9,7 @@
* file COPYING are met. Consult the file for details.
* @brief Internal header for rb_serial_t.
*/
-#include "ruby/3/config.h" /* for HAVE_LONG_LONG */
+#include "ruby/impl/config.h" /* for HAVE_LONG_LONG */
#include "ruby/defines.h" /* for LONG_LONG */
#ifndef HAVE_LONG_LONG