diff --git a/crypto/x509/x509_req.c b/crypto/x509/x509_req.c
index dec70ae991ee6a..d6413708a2654b 100644
--- a/crypto/x509/x509_req.c
+++ b/crypto/x509/x509_req.c
@@ -139,7 +139,7 @@ static STACK_OF(X509_EXTENSION) *get_extensions_by_nid(const X509_REQ *req,
                       ASN1_ITEM_rptr(X509_EXTENSIONS));
 }
 
-STACK_OF(X509_EXTENSION) *X509_REQ_get_extensions(const X509_REQ *req)
+STACK_OF(X509_EXTENSION) *X509_REQ_get_extensions(TYPEQOSSL_CONST_FUTURE X509_REQ *req)
 {
     STACK_OF(X509_EXTENSION) *exts = NULL;
     int *pnid;
diff --git a/include/openssl/types.h b/include/openssl/types.h
index c28028681fcefa..e4e18860e66cb5 100644
--- a/include/openssl/types.h
+++ b/include/openssl/types.h
@@ -33,6 +33,12 @@ extern "C" {
 # include <openssl/safestack.h>
 # include <openssl/macros.h>
 
+#if OPENSSL_VERSION_MAJOR >= 4
+# define OSSL_CONST_FUTURE const
+#else
+# define TYPEQOSSL_CONST_FUTURE
+#endif
+
 typedef struct ossl_provider_st OSSL_PROVIDER; /* Provider Object */
 
 # ifdef NO_ASN1_TYPEDEFS
diff --git a/include/openssl/x509.h.in b/include/openssl/x509.h.in
index 6f13feee09e969..7f31131a62021b 100644
--- a/include/openssl/x509.h.in
+++ b/include/openssl/x509.h.in
@@ -710,7 +710,7 @@ X509_PUBKEY *X509_REQ_get_X509_PUBKEY(X509_REQ *req);
 int X509_REQ_extension_nid(int nid);
 int *X509_REQ_get_extension_nids(void);
 void X509_REQ_set_extension_nids(int *nids);
-STACK_OF(X509_EXTENSION) *X509_REQ_get_extensions(const X509_REQ *req);
+STACK_OF(X509_EXTENSION) *X509_REQ_get_extensions(TYPEQOSSL_CONST_FUTURE X509_REQ *req);
 int X509_REQ_add_extensions_nid(X509_REQ *req,
                                 const STACK_OF(X509_EXTENSION) *exts, int nid);
 int X509_REQ_add_extensions(X509_REQ *req, const STACK_OF(X509_EXTENSION) *ext);