diff --git a/defaults/main.yml b/defaults/main.yml
index 5612310..aa0cf8a 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -48,10 +48,10 @@ psql_el_pgdg_packages:
   - python-psycopg2
 
 psql_el_scl_packages:
-  - rh-postgresql'{{ psql_version }}'-runtime
-  - rh-postgresql'{{ psql_version }}'-postgresql
-  - rh-postgresql'{{ psql_version }}'-postgresql-server
-  - rh-postgresql'{{ psql_version }}'-postgresql-contrib
+  - 'rh-postgresql{{ psql_version }}-runtime'
+  - 'rh-postgresql{{ psql_version }}-postgresql'
+  - 'rh-postgresql{{ psql_version }}-postgresql-server'
+  - 'rh-postgresql{{ psql_version }}-postgresql-contrib'
   - python-psycopg2
 
 psql_conf_parameters: