diff --git a/kvm.c b/kvm.c
index c69fcc4..3d2fa3b 100644
--- a/kvm.c
+++ b/kvm.c
@@ -162,7 +162,7 @@ static void kvm_register_mem_slot(struct kvm *kvm, u32 slot, u64 guest_phys, u64
 		.slot			= slot,
 		.guest_phys_addr	= guest_phys,
 		.memory_size		= size,
-		.userspace_addr		= (u64)userspace_addr,
+		.userspace_addr		= (unsigned long)userspace_addr,
 	};
 
 	ret = ioctl(kvm->vm_fd, KVM_SET_USER_MEMORY_REGION, &mem);
diff --git a/qcow.c b/qcow.c
index 8e1b70d..bb2345c 100644
--- a/qcow.c
+++ b/qcow.c
@@ -295,7 +295,7 @@ static int qcow1_write_sector(struct disk_image *disk, u64 sector, void *src, u3
 {
 	struct qcow *q = disk->priv;
 	struct qcow_header *header = q->header;
-	ssize_t nr_written;
+	u32 nr_written;
 	char *buf;
 	u64 offset;
 	ssize_t nr;