diff --git a/Include/internal/pycore_code.h b/Include/internal/pycore_code.h
index 32242f89b812e6..293c1ea4414e23 100644
--- a/Include/internal/pycore_code.h
+++ b/Include/internal/pycore_code.h
@@ -205,7 +205,7 @@ _PyLocals_GetKind(PyObject *kinds, int i)
 {
     assert(PyBytes_Check(kinds));
     assert(0 <= i && i < PyBytes_GET_SIZE(kinds));
-    char *ptr = PyBytes_AS_STRING(kinds);
+    const char *ptr = PyBytes_AS_STRING(kinds);
     return (_PyLocals_Kind)(ptr[i]);
 }
 
diff --git a/Modules/_sqlite/blob.c b/Modules/_sqlite/blob.c
index d81784409e5d91..cae1806d4ba284 100644
--- a/Modules/_sqlite/blob.c
+++ b/Modules/_sqlite/blob.c
@@ -457,7 +457,7 @@ subscript_slice(pysqlite_Blob *self, PyObject *item)
     }
     char *res_buf = PyBytesWriter_GetData(writer);
 
-    char *blob_buf = PyBytes_AS_STRING(blob);
+    const char *blob_buf = PyBytes_AS_STRING(blob);
     for (Py_ssize_t i = 0, j = 0; i < len; i++, j += step) {
         res_buf[i] = blob_buf[j];
     }
diff --git a/Modules/socketmodule.c b/Modules/socketmodule.c
index f9c77c631b5d2a..66525df2ec4bba 100644
--- a/Modules/socketmodule.c
+++ b/Modules/socketmodule.c
@@ -1803,7 +1803,7 @@ makesockaddr(SOCKET_T sockfd, struct sockaddr *addr, size_t addrlen, int proto)
    (in particular, numeric IP addresses). */
 struct maybe_idna {
     PyObject *obj;
-    char *buf;
+    const char *buf;
 };
 
 static void
diff --git a/Objects/stringlib/codecs.h b/Objects/stringlib/codecs.h
index 9e53fab842909a..6ea7ef1c9a92bf 100644
--- a/Objects/stringlib/codecs.h
+++ b/Objects/stringlib/codecs.h
@@ -406,7 +406,7 @@ STRINGLIB(utf8_encoder)(PyObject *unicode,
                     writer->overallocate = (newpos < size);
                 }
 
-                char *rep_str;
+                const char *rep_str;
                 Py_ssize_t rep_len;
                 if (PyBytes_Check(rep)) {
                     rep_str = PyBytes_AS_STRING(rep);
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 45d61c8b8b765a..2249280d0af811 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -7314,7 +7314,7 @@ unicode_encode_ucs1(PyObject *unicode,
                     writer->overallocate = (newpos < size);
                 }
 
-                char *rep_str;
+                const char *rep_str;
                 Py_ssize_t rep_len;
                 if (PyBytes_Check(rep)) {
                     /* Directly copy bytes result to output. */
diff --git a/Parser/action_helpers.c b/Parser/action_helpers.c
index 809f3c0a7b270e..8690dca8331b5c 100644
--- a/Parser/action_helpers.c
+++ b/Parser/action_helpers.c
@@ -1481,7 +1481,7 @@ expr_ty _PyPegen_decoded_constant_from_token(Parser* p, Token* tok) {
 }
 
 expr_ty _PyPegen_constant_from_token(Parser* p, Token* tok) {
-    char* bstr = PyBytes_AsString(tok->bytes);
+    const char* bstr = PyBytes_AsString(tok->bytes);
     if (bstr == NULL) {
         return NULL;
     }
@@ -1499,7 +1499,7 @@ expr_ty _PyPegen_constant_from_token(Parser* p, Token* tok) {
 }
 
 expr_ty _PyPegen_constant_from_string(Parser* p, Token* tok) {
-    char* the_str = PyBytes_AsString(tok->bytes);
+    const char* the_str = PyBytes_AsString(tok->bytes);
     if (the_str == NULL) {
         return NULL;
     }
diff --git a/Parser/string_parser.c b/Parser/string_parser.c
index b164dfbc81a933..431d2703d88e2c 100644
--- a/Parser/string_parser.c
+++ b/Parser/string_parser.c
@@ -70,7 +70,7 @@ warn_invalid_escape_sequence(Parser *p, const char* buffer, const char *first_in
     char first_quote = 0;
     if (lineno == t->lineno) {
         int quote_count = 0;
-        char* tok = PyBytes_AsString(t->bytes);
+        const char* tok = PyBytes_AsString(t->bytes);
         for (int i = 0; i < PyBytes_Size(t->bytes); i++) {
             if (tok[i] == '\'' || tok[i] == '\"') {
                 if (quote_count == 0) {