diff --git a/CMakeLists.txt b/CMakeLists.txt
index 65b805c33c..617c7516a0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1685,7 +1685,7 @@ if(NOT CURL_DISABLE_INSTALL)
   _add_if("RTMP"          USE_LIBRTMP)
   _add_if("MQTT"          NOT CURL_DISABLE_MQTT)
   _add_if("WS"            USE_WEBSOCKETS)
-  _add_if("WSS"           USE_WEBSOCKETS)
+  _add_if("WSS"           USE_WEBSOCKETS AND SSL_ENABLED)
   if(_items)
     list(SORT _items)
   endif()