diff --git a/ext/curl/interface.c b/ext/curl/interface.c
index a48e8a3c062..43af68e817d 100644
--- a/ext/curl/interface.c
+++ b/ext/curl/interface.c
@@ -1202,6 +1202,12 @@ PHP_MINIT_FUNCTION(curl)
 	REGISTER_CURL_CONSTANT(CURLSSLOPT_ALLOW_BEAST);
 #endif
 
+#if LIBCURL_VERSION_NUM >= 0x072200 /* Available since 7.34.0 */
+	REGISTER_CURL_CONSTANT(CURL_SSLVERSION_TLSv1_0);
+	REGISTER_CURL_CONSTANT(CURL_SSLVERSION_TLSv1_1);
+	REGISTER_CURL_CONSTANT(CURL_SSLVERSION_TLSv1_2);
+#endif
+
 #if CURLOPT_FTPASCII != 0
 	REGISTER_CURL_CONSTANT(CURLOPT_FTPASCII);
 #endif