The expansion of agricultural land remains one of the main drivers of deforestation in tropical regions, with severe negative environmental consequences. Stronger land property rights could possibly enable farmers to increase input intensity and productivity on the already cultivated land, thus reducing incentives to expand their farms by deforesting additional land. This hypothesis is tested with data from a panel survey of farm households in Sumatra, Indonesia, one of the hotspots of recent rainforest loss due to agricultural area expansion. The survey data are combined with satellite imageries to account for spatial patterns, such as historical forest locations. Results show that plots for which farmers hold formal land titles are cultivated more intensively than untitled plots, even after controlling for other relevant factors. Land titles also contribute to higher crop yields, hence confirming expectations. However, due to land policy restrictions, farmers located at the historic forest margins often do not hold formal titles for the land they cultivate. Without land titles, these farmers are less able to intensify and more likely to expand into the surrounding forest land to increase agricultural output. Indeed, forest closeness and past deforestation activities by households are found to be positively associated with current farm size. The findings suggest that the observed land policy restrictions are not conducive for forest conservation. In addition to improving farmer’s access to land titles for non-forest land, better recognition of customary land rights and moreeffective protection of forest land without recognized claims could be useful policy responses.