diff --git a/nixos/modules/services/mail/roundcube.nix b/nixos/modules/services/mail/roundcube.nix
index bdedfa1bb70..36dda619ad0 100644
--- a/nixos/modules/services/mail/roundcube.nix
+++ b/nixos/modules/services/mail/roundcube.nix
@@ -160,7 +160,7 @@ in
               ${pkgs.sudo}/bin/sudo -u ${pgSuperUser} psql postgres -c "create role ${cfg.database.username} with login password '${cfg.database.password}'";
               ${pkgs.sudo}/bin/sudo -u ${pgSuperUser} psql postgres -c "create database ${cfg.database.dbname} with owner ${cfg.database.username}";
             fi
-            PGPASSWORD=${cfg.database.password} ${pkgs.postgresql}/bin/psql -U ${cfg.database.username} \
+            PGPASSWORD="${cfg.database.password}" ${pkgs.postgresql}/bin/psql -U ${cfg.database.username} \
               -f ${cfg.package}/SQL/postgres.initial.sql \
               -h ${cfg.database.host} ${cfg.database.dbname}
             touch /var/lib/roundcube/db-created