diff --git a/src/conf/node_device_conf.c b/src/conf/node_device_conf.c
index 623a2cb79c..78a537d0ea 100644
--- a/src/conf/node_device_conf.c
+++ b/src/conf/node_device_conf.c
@@ -2218,6 +2218,7 @@ virNodeDevCapsDefFree(virNodeDevCapsDefPtr caps)
         break;
     case VIR_NODE_DEV_CAP_MDEV:
         VIR_FREE(data->mdev.type);
+        VIR_FREE(data->mdev.uuid);
         for (i = 0; i < data->mdev.nattributes; i++)
             virMediatedDeviceAttrFree(data->mdev.attributes[i]);
         VIR_FREE(data->mdev.attributes);
diff --git a/src/conf/node_device_conf.h b/src/conf/node_device_conf.h
index e3e1e788d4..9b8c7aadea 100644
--- a/src/conf/node_device_conf.h
+++ b/src/conf/node_device_conf.h
@@ -141,6 +141,7 @@ typedef virNodeDevCapMdev *virNodeDevCapMdevPtr;
 struct _virNodeDevCapMdev {
     char *type;
     unsigned int iommuGroupNumber;
+    char *uuid;
     virMediatedDeviceAttrPtr *attributes;
     size_t nattributes;
 };
diff --git a/src/node_device/node_device_udev.c b/src/node_device/node_device_udev.c
index 386f23ef3a..bdf0b03add 100644
--- a/src/node_device/node_device_udev.c
+++ b/src/node_device/node_device_udev.c
@@ -1013,7 +1013,6 @@ udevProcessMediatedDevice(struct udev_device *dev,
                           virNodeDeviceDefPtr def)
 {
     int ret = -1;
-    const char *uuidstr = NULL;
     int iommugrp = -1;
     char *linkpath = NULL;
     char *canonicalpath = NULL;
@@ -1041,8 +1040,8 @@ udevProcessMediatedDevice(struct udev_device *dev,
 
     data->type = g_path_get_basename(canonicalpath);
 
-    uuidstr = udev_device_get_sysname(dev);
-    if ((iommugrp = virMediatedDeviceGetIOMMUGroupNum(uuidstr)) < 0)
+    data->uuid = g_strdup(udev_device_get_sysname(dev));
+    if ((iommugrp = virMediatedDeviceGetIOMMUGroupNum(data->uuid)) < 0)
         goto cleanup;
 
     if (udevGenerateDeviceName(dev, def, NULL) != 0)