diff --git a/labgrid/toolchain/config/qemu/amd64/arm64/config.yaml b/labgrid/toolchain/config/qemu/amd64/arm64/config.yaml
index f5cebcd791fc9d8638ce38677d8f7dd67bc073df..f0b97d31a38bb6e83f3e73f24caa13c0e0495b4b 100644
--- a/labgrid/toolchain/config/qemu/amd64/arm64/config.yaml
+++ b/labgrid/toolchain/config/qemu/amd64/arm64/config.yaml
@@ -13,7 +13,7 @@ targets:
         memory: "2G"
         bios: "efi"
         nic: "user,model=virtio-net-pci"
-        extra_args: !template "-snapshot -smp 4 -drive file=$LG_QEMU_QCOW2_IMAGE,format=qcow2 -cdrom $LG_QEMU_VIRT_IMAGE"
+        extra_args: !template "-snapshot -drive file=$LG_QEMU_QCOW2_IMAGE,format=qcow2 -cdrom $LG_QEMU_VIRT_IMAGE"
       ShellDriver:
         prompt: " login: "
         login_prompt: " login: "
diff --git a/labgrid/toolchain/config/qemu/arm64/amd64/config.yaml b/labgrid/toolchain/config/qemu/arm64/amd64/config.yaml
index f7b14b5e8d5bc61dda099c7d7adde9985f2ff872..ad04e0158b02a90b59d65f76fb022a6eb25242fe 100644
--- a/labgrid/toolchain/config/qemu/arm64/amd64/config.yaml
+++ b/labgrid/toolchain/config/qemu/arm64/amd64/config.yaml
@@ -12,7 +12,7 @@ targets:
         cpu: "max"
         memory: "2G"
         nic: "user,model=e1000"
-        extra_args: !template "-snapshot -smp 4 -drive file=$LG_QEMU_QCOW2_IMAGE,format=qcow2 -cdrom $LG_QEMU_VIRT_IMAGE"
+        extra_args: !template "-snapshot -drive file=$LG_QEMU_QCOW2_IMAGE,format=qcow2 -cdrom $LG_QEMU_VIRT_IMAGE"
       ShellDriver:
         prompt: " login: "
         login_prompt: " login: "