1 files changed, 1 insertions, 1 deletions
diff --git a/math.c b/math.c
index 7edde60270..a508207e4d 100644
--- a/math.c
+++ b/math.c
@@ -9,7 +9,7 @@
 
 **********************************************************************/
 
-#include "ruby/config.h"
+#include "ruby/3/config.h"
 
 #ifdef _MSC_VER
 # define _USE_MATH_DEFINES 1