1 files changed, 1 insertions, 1 deletions
diff --git a/string.c b/string.c
index 0607726a07..ca21e0001c 100644
--- a/string.c
+++ b/string.c
@@ -11,7 +11,7 @@
 
 **********************************************************************/
 
-#include "ruby/config.h"
+#include "ruby/3/config.h"
 
 #include <ctype.h>
 #include <errno.h>