Transformation of s a social movement into a party is interesting in the realm of political science since it joins two theories, namely party theory and social movement theory. It is also interesting because there are some social movements that turns into party while the other does not. This paper tries to figure out why FPI as a social movement organization does not transform into party, even though FPI met preconditions of a transformation. The author uses four preconditions of transformation previously employed in examining a successful transformation of Five Star Movement (FSM) into a party in Italy. This paper shows that those four preconditions does not works since they did not considered one factor that is the capacity of the state in enforcing regulations toward the violation that have been done by social movements. The low capacity of the state eventually influencing the option of FPI in maintaining their traditional ways as a social movement. From a rational choice point of view FPI feels that the incentive structure to be a party is much smaller than remaining to be a social movement organization. For FPI, street is more promising compared to Senayan. Keywords: FPI, transformation, social movement, political party, contentious politics, low state capacity