diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index 654aac8453a80..df729259e99f0 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -20,8 +20,8 @@ module ConnectionHandling # :nodoc:
     VALID_CONN_PARAMS = [:host, :hostaddr, :port, :dbname, :user, :password, :connect_timeout,
                          :client_encoding, :options, :application_name, :fallback_application_name,
                          :keepalives, :keepalives_idle, :keepalives_interval, :keepalives_count,
-                         :tty, :sslmode, :requiressl, :sslcert, :sslkey, :sslrootcert, :sslcrl,
-                         :requirepeer, :krbsrvname, :gsslib, :service]
+                         :tty, :sslmode, :requiressl, :sslcompression, :sslcert, :sslkey,
+                         :sslrootcert, :sslcrl, :requirepeer, :krbsrvname, :gsslib, :service]
 
     # Establishes a connection to the database that's used by all Active Record objects
     def postgresql_connection(config)