diff --git a/lib/cmap/connection_pool.js b/lib/cmap/connection_pool.js
index 29d836b27e..55305c5185 100644
--- a/lib/cmap/connection_pool.js
+++ b/lib/cmap/connection_pool.js
@@ -46,6 +46,7 @@ const VALID_POOL_OPTIONS = new Set([
   'compression',
 
   // node Net options
+  'ssl',
   'localAddress',
   'localPort',
   'family',