diff --git a/qemu/tests/cfg/virtio_fs_multi_vms.cfg b/qemu/tests/cfg/virtio_fs_multi_vms.cfg
index 8caaf70480a31ef9f5f064011d531dde64c19029..9666fb7007109d1d3e49f877d4d6ef65e4a41705 100644
--- a/qemu/tests/cfg/virtio_fs_multi_vms.cfg
+++ b/qemu/tests/cfg/virtio_fs_multi_vms.cfg
@@ -9,7 +9,7 @@
     start_vm = yes
     mem = 4096
     mem_devs = mem1
-    backend_mem1 = memory-backend-file
+    backend_mem_mem1 = memory-backend-file
     size_mem1 = 4G
     use_mem_mem1 = no
     share_mem = yes
diff --git a/qemu/tests/cfg/virtio_fs_readonly.cfg b/qemu/tests/cfg/virtio_fs_readonly.cfg
index ca05e9a8933c22e7a25a9b7c67ea079b2c5a5c92..7236e1835de7d3c29b703bc5068551c73528af50 100644
--- a/qemu/tests/cfg/virtio_fs_readonly.cfg
+++ b/qemu/tests/cfg/virtio_fs_readonly.cfg
@@ -18,7 +18,7 @@
     fs_dest = '/mnt/${fs_target}'
     mem = 4096
     mem_devs = mem1
-    backend_mem1 = memory-backend-file
+    backend_mem_mem1 = memory-backend-file
     mem-path_mem1 = /dev/shm
     size_mem1 = 4G
     use_mem_mem1 = no
diff --git a/qemu/tests/cfg/virtio_fs_share_data.cfg b/qemu/tests/cfg/virtio_fs_share_data.cfg
index f254dd703e841785c5ab3a7ddc1ae1c2182eabb3..e2926fd37641bc74cb848aa45e6f8ef2e870d6e9 100644
--- a/qemu/tests/cfg/virtio_fs_share_data.cfg
+++ b/qemu/tests/cfg/virtio_fs_share_data.cfg
@@ -18,7 +18,7 @@
     fs_driver_props = {"queue-size": 1024}
     mem = 4096
     mem_devs = mem1
-    backend_mem1 = memory-backend-file
+    backend_mem_mem1 = memory-backend-file
     mem-path_mem1 = /dev/shm
     size_mem1 = 4G
     use_mem_mem1 = no