Software development requires intensive communication between the requirements engineers and software stakeholders, particularly during the Requirements Engineering (RE) phase. Therefore, the individuals' culture might influence both the RE process and the result. Our aims are to investigate the extend of cultural influences on the RE process, and to analyze how the RE process can be adapted to take into account cultural aspects. The model we present is based on Hofstede's cultural theory. The model was applied on a pilot case study in the context of the conservative Saudi Arabian culture. The results reveal 6 RE aspects and 10 cultural factors that have a large impact on the RE practice.