diff --git a/templates/postgresql.conf-9.4.j2 b/templates/postgresql.conf-9.4.j2
index 90930570..9117ca22 100644
--- a/templates/postgresql.conf-9.4.j2
+++ b/templates/postgresql.conf-9.4.j2
@@ -548,7 +548,7 @@ default_text_search_config = '{{postgresql_default_text_search_config}}'
 
 dynamic_library_path = '{{postgresql_dynamic_library_path}}'
 local_preload_libraries = '{{postgresql_local_preload_libraries|join(',')}}'
-session_preload_libraries = '{{postgresql_session_preload_libraries}}'
+session_preload_libraries = '{{postgresql_session_preload_libraries|join(',')}}'
 
 
 #------------------------------------------------------------------------------