diff --git a/hw/vfio_pci.c b/hw/vfio_pci.c
index a24558aaa0..a1eeced8fd 100644
--- a/hw/vfio_pci.c
+++ b/hw/vfio_pci.c
@@ -768,7 +768,7 @@ static int vfio_dma_map(VFIOContainer *container, target_phys_addr_t iova,
     struct vfio_iommu_type1_dma_map map = {
         .argsz = sizeof(map),
         .flags = VFIO_DMA_MAP_FLAG_READ,
-        .vaddr = (__u64)vaddr,
+        .vaddr = (__u64)(intptr_t)vaddr,
         .iova = iova,
         .size = size,
     };