This study investigated the protective role of maternal adaptive emotion regulation in applying controlling parenting practices while assisting their toddler in completing two different problem-solving tasks. More specifically, the role of maternal emotion regulation was examined relative to significant situational (i.e., task difficulty) and child-related (i.e., toddlers’ temperamental negative affectivity) risk factors for controlling parenting. Results showed that (1) mothers’ integrative emotion regulation was negatively related to observed maternal control across tasks, (2) mothers were more controlling during a difficult task compared to an easy task, and (3) toddlers’ temperamental negative affectivity related positively to the use of observed maternal control, albeit only during a difficult task. These results highlight the relevance of maternal emotion regulation processes during parenting practices beyond contextual and temperamental correlates. Directions for future research and clinical implications are discussed.