diff --git a/src/pq/connection.cr b/src/pq/connection.cr
index 0838bcdb..bda8efc2 100644
--- a/src/pq/connection.cr
+++ b/src/pq/connection.cr
@@ -33,7 +33,7 @@ module PQ
       end
 
       @soc = soc
-      negotiate_ssl if @soc.is_a?(TCPSocket)
+      negotiate_ssl if @soc.is_a?(TCPSocket) && @conninfo.sslmode != :disable
     end
 
     private def negotiate_ssl