diff --git a/include/curl/curl.h b/include/curl/curl.h
index 5528d87bf0b542830262b5dbf9354b877c6f8368..ebcd07a0086a80ec84ae5b15aa97d44497df3dde 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -527,7 +527,10 @@ typedef enum {
 #ifndef CURL_NO_OLDIES /* define this to test if your app builds with all
                           the obsolete stuff removed! */
 
-/* Previously obsoletes error codes re-used in 7.24.0 */
+/* Previously obsolete error code re-used in 7.38.0 */
+#define CURLE_OBSOLETE16 CURLE_HTTP2
+
+/* Previously obsolete error codes re-used in 7.24.0 */
 #define CURLE_OBSOLETE10 CURLE_FTP_ACCEPT_FAILED
 #define CURLE_OBSOLETE12 CURLE_FTP_ACCEPT_TIMEOUT