diff --git a/Doc/includes/custom2.c b/Doc/includes/custom2.c
index 5bacab7a2a9714..bfa072e5263adc 100644
--- a/Doc/includes/custom2.c
+++ b/Doc/includes/custom2.c
@@ -1,6 +1,6 @@
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
-#include "structmember.h"
+#include <structmember.h>
 
 typedef struct {
     PyObject_HEAD
diff --git a/Doc/includes/custom3.c b/Doc/includes/custom3.c
index 2b7a99ecf96c76..7f46d3643927ae 100644
--- a/Doc/includes/custom3.c
+++ b/Doc/includes/custom3.c
@@ -1,6 +1,6 @@
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
-#include "structmember.h"
+#include <structmember.h>
 
 typedef struct {
     PyObject_HEAD
diff --git a/Doc/includes/custom4.c b/Doc/includes/custom4.c
index 584992fc5f1a8a..e8ac5bb8f594e3 100644
--- a/Doc/includes/custom4.c
+++ b/Doc/includes/custom4.c
@@ -1,6 +1,6 @@
 #define PY_SSIZE_T_CLEAN
 #include <Python.h>
-#include "structmember.h"
+#include <structmember.h>
 
 typedef struct {
     PyObject_HEAD