In-situ electrical measurements and transmission electron microscopy observations of tellurium ultrathin films evaporated onto poly(1-butene) substrates have been correlated. A surprising increase of the current through the deposits of 1-2 orders of magnitude directly after deposition were found. In a system with constant mass we consider that structural changes in the deposit are responsible for this behaviour. Micrographs of the structure of the deposit support this idea by providing evidence of mutual coalescence. A further increase of the current by 1-2 orders of magnitude in 2 h can be explained by a continuous crystallization of the initially amorphous tellurium layer.