diff --git a/Objects/genobject.c b/Objects/genobject.c
index 2c06bdcc72642f..ce7dd48a17cfb6 100644
--- a/Objects/genobject.c
+++ b/Objects/genobject.c
@@ -11,10 +11,10 @@ static PyObject *gen_close(PyGenObject *, PyObject *);
 static PyObject *async_gen_asend_new(PyAsyncGenObject *, PyObject *);
 static PyObject *async_gen_athrow_new(PyAsyncGenObject *, PyObject *);
 
-static char *NON_INIT_CORO_MSG = "can't send non-None value to a "
+static const char *NON_INIT_CORO_MSG = "can't send non-None value to a "
                                  "just-started coroutine";
 
-static char *ASYNC_GEN_IGNORED_EXIT_MSG =
+static const char *ASYNC_GEN_IGNORED_EXIT_MSG =
                                  "async generator ignored GeneratorExit";
 
 static inline int
diff --git a/Python/codecs.c b/Python/codecs.c
index d4b34f8397f05a..4bd28ec9c761ca 100644
--- a/Python/codecs.c
+++ b/Python/codecs.c
@@ -1415,7 +1415,7 @@ static PyObject *surrogateescape_errors(PyObject *self, PyObject *exc)
 static int _PyCodecRegistry_Init(void)
 {
     static struct {
-        char *name;
+        const char *name;
         PyMethodDef def;
     } methods[] =
     {
diff --git a/Python/errors.c b/Python/errors.c
index 197d9779b390c7..1360c0d91a33fa 100644
--- a/Python/errors.c
+++ b/Python/errors.c
@@ -584,7 +584,7 @@ PyErr_SetFromErrnoWithFilenameObjects(PyObject *exc, PyObject *filenameObject, P
 
 #ifndef MS_WINDOWS
     if (i != 0) {
-        char *s = strerror(i);
+        const char *s = strerror(i);
         message = PyUnicode_DecodeLocale(s, "surrogateescape");
     }
     else {