diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
index da84abf4fc..0d4bc0aae8 100644
--- a/hw/vfio/platform.c
+++ b/hw/vfio/platform.c
@@ -643,6 +643,8 @@ static void vfio_platform_realize(DeviceState *dev, Error **errp)
     vbasedev->dev = dev;
     vbasedev->ops = &vfio_platform_ops;
 
+    qemu_mutex_init(&vdev->intp_mutex);
+
     trace_vfio_platform_realize(vbasedev->sysfsdev ?
                                 vbasedev->sysfsdev : vbasedev->name,
                                 vdev->compat);