diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index d88e67c..9ded4e6 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -5407,11 +5407,13 @@
  *
  * \return            0 on success. An SSL specific error on failure.
  */
+ #if defined(MBEDTLS_SSL_CONTEXT_SERIALIZATION) || !defined(MBEDTLS_SSL_PROTO_TLS1_2)
 int mbedtls_ssl_export_keying_material(mbedtls_ssl_context *ssl,
                                        uint8_t *out, const size_t key_len,
                                        const char *label, const size_t label_len,
                                        const unsigned char *context, const size_t context_len,
                                        const int use_context);
+#endif
 #ifdef __cplusplus
 }
 #endif