diff --git a/files/postgres/postgresql.conf b/files/postgres/postgresql.conf
index c5033ab..07463f3 100644
--- a/files/postgres/postgresql.conf
+++ b/files/postgres/postgresql.conf
@@ -5,7 +5,7 @@
 #-------------------------------------------------------------------------------
 
 # Change pg_hba location
-hba_file = "/etc/postgres/pg_hba.conf"
+hba_file = '/etc/postgres/pg_hba.conf'
 
 
 #-------------------------------------------------------------------------------
@@ -16,7 +16,7 @@ hba_file = "/etc/postgres/pg_hba.conf"
 
 # Empty listen addresses to disable listening via TCP/IP
 # because we want only uni socket connections
-listen_addresses = ""
+listen_addresses = ''
 
 
 #-------------------------------------------------------------------------------
@@ -26,4 +26,4 @@ listen_addresses = ""
 #-------------------------------------------------------------------------------
 
 # Redirect logs to stderr to be managed by journald
-log_destination = "stderr"
+log_destination = 'stderr'