On October 8, 1939, the Poland-Slovakia border shrank due to Nazi Germany expanding Upper Silesia into Zaolzie and parts of Poland.

On November 24, 1939, the border changed once again as Slovakia annexed (going from West to East) the Skalité territories; the northern part of Oravská Polhora including the mountain peak of Jalovec; the northern parts of Trstená and Bobrov; northeastern Orava with Jabłonka; Hladovka and Sucha Hora; Tatranská Javorina and some lakes southwest of it; northwestern Spiš with Nowa Biała; an islet in Dunajec in Červený Kláštor and Majere; Lesnica; part of Poprad and the bank near its bend in Gmina Piwniczna-Zdrój, west of the small river of Wierchomlanka; a part of a local forest on the west side of Poprad in the east side of Sulín; territory up to Poprad in Sulín and Malý Lipník; a bank on Poprad, slightly south of Andrzejówka and another one slightly further east and a third one immediately northwest of Legnava, across Poprad; the northern part of Cigeľka; the northern part of the eastern salient of Osadné.

Near a local observation tower on the Dukla Pass, in the area of the Polish town of Barwinek and the Slovakian town of Vyšný Komárnik, Slovakia ceded 376 m² of territory to Poland, while Poland ceded an area equivalent in size elsewhere.

This change was needed in order to restore a common border road, built in 1958, which allowed Slovak tourists to visit historic battle sites.

This adjustment was made in response to residents' requests, as a road built after 1953 had crossed the border multiple times, causing significant access difficulties to plots on both sides.