Author stance, which echoes authors' attitudes, personal thought, and feeling within the text, can be revealed through preference of voice construction. This study aims at examining the quantitative data of active and passive voice construction used in the English Department of State University of Malang students' theses, as well as exploring the implication arising from the issue. The data in this descriptive qualitative study is taken from a corpus of English Department undergraduate theses written in 2011 to 2013. The corpus data and the frequency of both voice constructions of selected Biber's (2004) stance verbs are calculated using Ant.Conc 3.2.4 corpus software. Findings show that the frequency of active voice construction is higher than that of the passive, as much as 64.8% out of 3901 tokens of the stance verb suggest, expect, show, predict, report, believe, hope, allow are in active voice. The most frequent stance verb in active voice constructions is the verb show, while that in passive voice is the verb expect and the least frequent in both voice constructions is the verb predict. This study suggests that the frequent active voice construction found in Indonesian undergraduate theses resembles English native author's writing style. This fact may indicate Indonesian student author's determination to be acknowledged internationally.