diff --git a/tests/libqos/virtio-pci.c b/tests/libqos/virtio-pci.c
index c74a669..3aa6cab 100644
--- a/tests/libqos/virtio-pci.c
+++ b/tests/libqos/virtio-pci.c
@@ -60,25 +60,25 @@ static void qvirtio_pci_assign_device(QVirtioDevice *d, void *data)
     *vpcidev = (QVirtioPCIDevice *)d;
 }
 
-static uint8_t qvirtio_pci_config_readb(QVirtioDevice *d, void *addr)
+static uint8_t qvirtio_pci_config_readb(QVirtioDevice *d, uint64_t addr)
 {
     QVirtioPCIDevice *dev = (QVirtioPCIDevice *)d;
-    return qpci_io_readb(dev->pdev, addr);
+    return qpci_io_readb(dev->pdev, (void *)(uintptr_t)addr);
 }
 
-static uint16_t qvirtio_pci_config_readw(QVirtioDevice *d, void *addr)
+static uint16_t qvirtio_pci_config_readw(QVirtioDevice *d, uint64_t addr)
 {
     QVirtioPCIDevice *dev = (QVirtioPCIDevice *)d;
-    return qpci_io_readw(dev->pdev, addr);
+    return qpci_io_readw(dev->pdev, (void *)(uintptr_t)addr);
 }
 
-static uint32_t qvirtio_pci_config_readl(QVirtioDevice *d, void *addr)
+static uint32_t qvirtio_pci_config_readl(QVirtioDevice *d, uint64_t addr)
 {
     QVirtioPCIDevice *dev = (QVirtioPCIDevice *)d;
-    return qpci_io_readl(dev->pdev, addr);
+    return qpci_io_readl(dev->pdev, (void *)(uintptr_t)addr);
 }
 
-static uint64_t qvirtio_pci_config_readq(QVirtioDevice *d, void *addr)
+static uint64_t qvirtio_pci_config_readq(QVirtioDevice *d, uint64_t addr)
 {
     QVirtioPCIDevice *dev = (QVirtioPCIDevice *)d;
     int i;
@@ -86,11 +86,13 @@ static uint64_t qvirtio_pci_config_readq(QVirtioDevice *d, void *addr)
 
     if (qtest_big_endian()) {
         for (i = 0; i < 8; ++i) {
-            u64 |= (uint64_t)qpci_io_readb(dev->pdev, addr + i) << (7 - i) * 8;
+            u64 |= (uint64_t)qpci_io_readb(dev->pdev,
+                                (void *)(uintptr_t)addr + i) << (7 - i) * 8;
         }
     } else {
         for (i = 0; i < 8; ++i) {
-            u64 |= (uint64_t)qpci_io_readb(dev->pdev, addr + i) << i * 8;
+            u64 |= (uint64_t)qpci_io_readb(dev->pdev,
+                                (void *)(uintptr_t)addr + i) << i * 8;
         }
     }
 
diff --git a/tests/libqos/virtio.c b/tests/libqos/virtio.c
index a061289..3205b88 100644
--- a/tests/libqos/virtio.c
+++ b/tests/libqos/virtio.c
@@ -12,25 +12,25 @@
 #include "libqos/virtio.h"
 
 uint8_t qvirtio_config_readb(const QVirtioBus *bus, QVirtioDevice *d,
-                                                                void *addr)
+                                                                uint64_t addr)
 {
     return bus->config_readb(d, addr);
 }
 
 uint16_t qvirtio_config_readw(const QVirtioBus *bus, QVirtioDevice *d,
-                                                                void *addr)
+                                                                uint64_t addr)
 {
     return bus->config_readw(d, addr);
 }
 
 uint32_t qvirtio_config_readl(const QVirtioBus *bus, QVirtioDevice *d,
-                                                                void *addr)
+                                                                uint64_t addr)
 {
     return bus->config_readl(d, addr);
 }
 
 uint64_t qvirtio_config_readq(const QVirtioBus *bus, QVirtioDevice *d,
-                                                                void *addr)
+                                                                uint64_t addr)
 {
     return bus->config_readq(d, addr);
 }
diff --git a/tests/libqos/virtio.h b/tests/libqos/virtio.h
index 29fbacb..2449fee 100644
--- a/tests/libqos/virtio.h
+++ b/tests/libqos/virtio.h
@@ -93,10 +93,10 @@ typedef struct QVRingIndirectDesc {
 } QVRingIndirectDesc;
 
 typedef struct QVirtioBus {
-    uint8_t (*config_readb)(QVirtioDevice *d, void *addr);
-    uint16_t (*config_readw)(QVirtioDevice *d, void *addr);
-    uint32_t (*config_readl)(QVirtioDevice *d, void *addr);
-    uint64_t (*config_readq)(QVirtioDevice *d, void *addr);
+    uint8_t (*config_readb)(QVirtioDevice *d, uint64_t addr);
+    uint16_t (*config_readw)(QVirtioDevice *d, uint64_t addr);
+    uint32_t (*config_readl)(QVirtioDevice *d, uint64_t addr);
+    uint64_t (*config_readq)(QVirtioDevice *d, uint64_t addr);
 
     /* Get features of the device */
     uint32_t (*get_features)(QVirtioDevice *d);
@@ -144,13 +144,13 @@ static inline uint32_t qvring_size(uint32_t num, uint32_t align)
 }
 
 uint8_t qvirtio_config_readb(const QVirtioBus *bus, QVirtioDevice *d,
-                                                                void *addr);
+                                                                uint64_t addr);
 uint16_t qvirtio_config_readw(const QVirtioBus *bus, QVirtioDevice *d,
-                                                                void *addr);
+                                                                uint64_t addr);
 uint32_t qvirtio_config_readl(const QVirtioBus *bus, QVirtioDevice *d,
-                                                                void *addr);
+                                                                uint64_t addr);
 uint64_t qvirtio_config_readq(const QVirtioBus *bus, QVirtioDevice *d,
-                                                                void *addr);
+                                                                uint64_t addr);
 uint32_t qvirtio_get_features(const QVirtioBus *bus, QVirtioDevice *d);
 void qvirtio_set_features(const QVirtioBus *bus, QVirtioDevice *d,
                                                             uint32_t features);
diff --git a/tests/virtio-blk-test.c b/tests/virtio-blk-test.c
index 89d7cbf..2424c84 100644
--- a/tests/virtio-blk-test.c
+++ b/tests/virtio-blk-test.c
@@ -157,7 +157,8 @@ static void pci_basic(void)
     /* MSI-X is not enabled */
     addr = dev->addr + QVIRTIO_DEVICE_SPECIFIC_NO_MSIX;
 
-    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev, addr);
+    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev,
+                                                    (uint64_t)(uintptr_t)addr);
     g_assert_cmpint(capacity, ==, TEST_IMAGE_SIZE / 512);
 
     features = qvirtio_get_features(&qvirtio_pci, &dev->vdev);
@@ -303,7 +304,8 @@ static void pci_indirect(void)
     /* MSI-X is not enabled */
     addr = dev->addr + QVIRTIO_DEVICE_SPECIFIC_NO_MSIX;
 
-    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev, addr);
+    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev,
+                                                    (uint64_t)(uintptr_t)addr);
     g_assert_cmpint(capacity, ==, TEST_IMAGE_SIZE / 512);
 
     features = qvirtio_get_features(&qvirtio_pci, &dev->vdev);
@@ -394,7 +396,8 @@ static void pci_config(void)
     /* MSI-X is not enabled */
     addr = dev->addr + QVIRTIO_DEVICE_SPECIFIC_NO_MSIX;
 
-    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev, addr);
+    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev,
+                                                    (uint64_t)(uintptr_t)addr);
     g_assert_cmpint(capacity, ==, TEST_IMAGE_SIZE / 512);
 
     qvirtio_set_driver_ok(&qvirtio_pci, &dev->vdev);
@@ -403,7 +406,8 @@ static void pci_config(void)
                                                     " 'size': %d } }", n_size);
     qvirtio_wait_config_isr(&qvirtio_pci, &dev->vdev, QVIRTIO_BLK_TIMEOUT_US);
 
-    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev, addr);
+    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev,
+                                                    (uint64_t)(uintptr_t)addr);
     g_assert_cmpint(capacity, ==, n_size / 512);
 
     qvirtio_pci_device_disable(dev);
@@ -438,7 +442,8 @@ static void pci_msix(void)
     /* MSI-X is enabled */
     addr = dev->addr + QVIRTIO_DEVICE_SPECIFIC_MSIX;
 
-    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev, addr);
+    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev,
+                                                    (uint64_t)(uintptr_t)addr);
     g_assert_cmpint(capacity, ==, TEST_IMAGE_SIZE / 512);
 
     features = qvirtio_get_features(&qvirtio_pci, &dev->vdev);
@@ -458,7 +463,8 @@ static void pci_msix(void)
 
     qvirtio_wait_config_isr(&qvirtio_pci, &dev->vdev, QVIRTIO_BLK_TIMEOUT_US);
 
-    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev, addr);
+    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev,
+                                                    (uint64_t)(uintptr_t)addr);
     g_assert_cmpint(capacity, ==, n_size / 512);
 
     /* Write request */
@@ -547,7 +553,8 @@ static void pci_idx(void)
     /* MSI-X is enabled */
     addr = dev->addr + QVIRTIO_DEVICE_SPECIFIC_MSIX;
 
-    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev, addr);
+    capacity = qvirtio_config_readq(&qvirtio_pci, &dev->vdev,
+                                                    (uint64_t)(uintptr_t)addr);
     g_assert_cmpint(capacity, ==, TEST_IMAGE_SIZE / 512);
 
     features = qvirtio_get_features(&qvirtio_pci, &dev->vdev);
