Issue #25923: Added the const qualifier to static constant arrays.
diff --git a/Modules/_testbuffer.c b/Modules/_testbuffer.c
index 43db8a8..13d3ccc 100644
--- a/Modules/_testbuffer.c
+++ b/Modules/_testbuffer.c
@@ -13,7 +13,7 @@
PyObject *calcsize = NULL;
/* cache simple format string */
-static const char *simple_fmt = "B";
+static const char simple_fmt[] = "B";
PyObject *simple_format = NULL;
#define SIMPLE_FORMAT(fmt) (fmt == NULL || strcmp(fmt, "B") == 0)
#define FIX_FORMAT(fmt) (fmt == NULL ? "B" : fmt)