diff --git a/lib/curl_schannel.h b/lib/curl_schannel.h
index 4f48f16e6158db2b447fbff67d18b693561883fe..cf5b79a6b3eabe90c6308a6867e056ec339cfd47 100644
--- a/lib/curl_schannel.h
+++ b/lib/curl_schannel.h
@@ -135,6 +135,7 @@ size_t Curl_schannel_version(char *buffer, size_t size);
 #define curlssl_version Curl_schannel_version
 #define curlssl_check_cxn(x) (x=x, -1)
 #define curlssl_data_pending Curl_schannel_data_pending
-
+#define curlssl_random /* not used with the schannel backend */
+#define curlssl_md5sum /* not used with the schannel backend */
 #endif /* USE_SCHANNEL */
 #endif /* HEADER_CURL_SCHANNEL_H */