diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index 9062be38ab824ee349cf9a3789aa84d55c80295a..8bf23e9f308d1ca6aa35f00b674c06e311a79cce 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -776,38 +776,28 @@ qemuMigrationSrcNBDCopyCancel(virQEMUDriverPtr driver,
 }
 
 
-static int
-qemuMigrationSrcNBDStorageCopyBlockdev(virQEMUDriverPtr driver,
-                                       virDomainObjPtr vm,
-                                       virDomainDiskDefPtr disk,
-                                       const char *diskAlias,
-                                       const char *host,
-                                       int port,
-                                       unsigned long long mirror_speed,
-                                       unsigned int mirror_shallow,
-                                       const char *tlsAlias)
+static virStorageSourcePtr
+qemuMigrationSrcNBDStorageCopyBlockdevPrepareSource(virDomainDiskDefPtr disk,
+                                                    const char *host,
+                                                    int port,
+                                                    const char *tlsAlias)
 {
-    g_autoptr(qemuBlockStorageSourceAttachData) data = NULL;
-    qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
-    int mon_ret = 0;
     g_autoptr(virStorageSource) copysrc = NULL;
 
-    VIR_DEBUG("starting blockdev mirror for disk=%s to host=%s", diskAlias, host);
-
     if (!(copysrc = virStorageSourceNew()))
-        return -1;
+        return NULL;
 
     copysrc->type = VIR_STORAGE_TYPE_NETWORK;
     copysrc->protocol = VIR_STORAGE_NET_PROTOCOL_NBD;
     copysrc->format = VIR_STORAGE_FILE_RAW;
 
     if (!(copysrc->backingStore = virStorageSourceNew()))
-        return -1;
+        return NULL;
 
-    copysrc->path = g_strdup(diskAlias);
+    if (!(copysrc->path = qemuAliasDiskDriveFromDisk(disk)))
+        return NULL;
 
-    if (VIR_ALLOC_N(copysrc->hosts, 1) < 0)
-        return -1;
+    copysrc->hosts = g_new0(virStorageNetHostDef, 1);
 
     copysrc->nhosts = 1;
     copysrc->hosts->transport = VIR_STORAGE_NET_HOST_TRANS_TCP;
@@ -819,6 +809,31 @@ qemuMigrationSrcNBDStorageCopyBlockdev(virQEMUDriverPtr driver,
     copysrc->nodestorage = g_strdup_printf("migration-%s-storage", disk->dst);
     copysrc->nodeformat = g_strdup_printf("migration-%s-format", disk->dst);
 
+    return g_steal_pointer(&copysrc);
+}
+
+
+static int
+qemuMigrationSrcNBDStorageCopyBlockdev(virQEMUDriverPtr driver,
+                                       virDomainObjPtr vm,
+                                       virDomainDiskDefPtr disk,
+                                       const char *diskAlias,
+                                       const char *host,
+                                       int port,
+                                       unsigned long long mirror_speed,
+                                       unsigned int mirror_shallow,
+                                       const char *tlsAlias)
+{
+    g_autoptr(qemuBlockStorageSourceAttachData) data = NULL;
+    qemuDomainDiskPrivatePtr diskPriv = QEMU_DOMAIN_DISK_PRIVATE(disk);
+    int mon_ret = 0;
+    g_autoptr(virStorageSource) copysrc = NULL;
+
+    VIR_DEBUG("starting blockdev mirror for disk=%s to host=%s", diskAlias, host);
+
+    if (!(copysrc = qemuMigrationSrcNBDStorageCopyBlockdevPrepareSource(disk, host, port, tlsAlias)))
+        return -1;
+
     /* Migration via blockdev-mirror was supported sooner than the auto-read-only
      * feature was added to qemu */
     if (!(data = qemuBlockStorageSourceAttachPrepareBlockdev(copysrc,