"This is definitely a very important victory for the squad, because in January, in part due to bad luck, we lost a few too many points," Lichtsteiner said. "We showed that even if we struggled a bit, we were able to bring home these three points."
Elsewhere, third-placed Lazio lost 3-2 at Genoa, where Marco Rigoni scored the winner in the fifth minute of added time with a header.
Marco Borriello and Andrea Bertollacci had scored for Genoa in the 16th and 22nd and Sergio Floccari and Stefano Mauri — with a penalty — replied for Lazio in the 58th and 82nd.
The result left Lazio nine points behind Juventus.
Meanwhile, Inter lost 3-1 at Siena.
Innocent Emeghara, who just signed on loan from French club Lorient, gave Siena the lead in the 21st. Antonio Cassano quickly equalized for Inter in the 22nd but Alessio Sestu restored Siena's lead four minutes later and Alessandro Rosina added a penalty for the hosts in the 56th.
Fiorentina moved provisionally into fifth with a 2-0 win over Parma, with goals from Luca Toni and Stevan Jovetic.
In other matches, Atalanta won 2-1 at last-placed Palermo and Bologna won 3-2 at Pescara.