bpo-39943: Add the const qualifier to pointers on non-mutable PyUnicode data. (GH-19345)
diff --git a/Modules/cjkcodecs/multibytecodec.h b/Modules/cjkcodecs/multibytecodec.h
index 4d2b355..5946821 100644
--- a/Modules/cjkcodecs/multibytecodec.h
+++ b/Modules/cjkcodecs/multibytecodec.h
@@ -30,7 +30,7 @@
typedef int (*mbcodec_init)(const void *config);
typedef Py_ssize_t (*mbencode_func)(MultibyteCodec_State *state,
const void *config,
- int kind, void *data,
+ int kind, const void *data,
Py_ssize_t *inpos, Py_ssize_t inlen,
unsigned char **outbuf, Py_ssize_t outleft,
int flags);