diff --git a/Modules/sha256module.c b/Modules/sha256module.c
index 8da36b7..b40bb70 100644
--- a/Modules/sha256module.c
+++ b/Modules/sha256module.c
@@ -624,7 +624,7 @@
 static PyObject *
 SHA256_new(PyObject *self, PyObject *args, PyObject *kwdict)
 {
-    static char *kwlist[] = {"string", NULL};
+    static const char *kwlist[] = {"string", NULL};
     SHAobject *new;
     unsigned char *cp = NULL;
     int len;
@@ -655,7 +655,7 @@
 static PyObject *
 SHA224_new(PyObject *self, PyObject *args, PyObject *kwdict)
 {
-    static char *kwlist[] = {"string", NULL};
+    static const char *kwlist[] = {"string", NULL};
     SHAobject *new;
     unsigned char *cp = NULL;
     int len;