This study seeks to address two interrelated questions: Does Indonesia underbalance against China? Why does President Joko Widodo stick with the strategy of to this day? The study lays out three main arguments. First, there are two types of strategies: the appropriate and inappropriate one (under-balancing). Indonesia, under the first and beginning of the second term of Jokowi presidency, adopts the prudent strategy. Thus, it does not underbalance against the Chinese military threats in the South China Sea. Such prudent strategy consists of several dimensions: facilitating the United States’ security presence in Asia, engaging major powers such as China in bilateral and multilateral economic and political–military ties to socialise China into a peace-loving country. Second, Indonesia’s non-balancing action, which is the second-best strategy after a more traditional direct internal and external military balancing, is considered a prudent choice, for three main reasons: (a) it is predicated on the assessment that China is perceived as a risk-averse limited-aims revisionist power; (b) Indonesia has very limited capacity to directly balance China and (c) the United States is perceived to be willing and able to balance China. Lastly, the continuity of this strategy, which started during the post-Cold War era, is partly related to the positive feedback effects or self-reinforcing process of existing formal institutions.