diff --git a/nixos/tests/overlayfs.nix b/nixos/tests/overlayfs.nix
index 142e7d378b2f..1768f1fea1ed 100644
--- a/nixos/tests/overlayfs.nix
+++ b/nixos/tests/overlayfs.nix
@@ -15,36 +15,33 @@ import ./make-test-python.nix ({ pkgs, ... }: {
 
     # Test ext4 + overlayfs
     machine.succeed(
-        """
-          mkfs.ext4 -F -L overlay-ext4 /dev/vdb
-          mount -t ext4 /dev/vdb /tmp/mnt
-          mkdir -p /tmp/mnt/upper /tmp/mnt/lower /tmp/mnt/work /tmp/mnt/merged
-          # Setup some existing files
-          echo 'Replace' > /tmp/mnt/lower/replace.txt
-          echo 'Append' > /tmp/mnt/lower/append.txt
-          echo 'Overwrite' > /tmp/mnt/lower/overwrite.txt
-          mount -t overlay overlay -o lowerdir=/tmp/mnt/lower,upperdir=/tmp/mnt/upper,workdir=/tmp/mnt/work /tmp/mnt/merged
-          # Test new
-          echo 'New' > /tmp/mnt/merged/new.txt
-          [[ "\$(cat /tmp/mnt/merged/new.txt)" == "New" ]]
-          # Test replace
-          [[ "\$(cat /tmp/mnt/merged/replace.txt)" == "Replace" ]]
-          echo 'Replaced' > /tmp/mnt/merged/replace-tmp.txt
-          mv /tmp/mnt/merged/replace-tmp.txt /tmp/mnt/merged/replace.txt
-          [[ "\$(cat /tmp/mnt/merged/replace.txt)" == "Replaced" ]]
-          # Overwrite
-          [[ "\$(cat /tmp/mnt/merged/overwrite.txt)" == "Overwrite" ]]
-          echo 'Overwritten' > /tmp/mnt/merged/overwrite.txt
-          [[ "\$(cat /tmp/mnt/merged/overwrite.txt)" == "Overwritten" ]]
-          # Test append
-          [[ "\$(cat /tmp/mnt/merged/append.txt)" == "Append" ]]
-          echo 'ed' >> /tmp/mnt/merged/append.txt
-          #"cat /tmp/mnt/merged/append.txt && exit 1
-          [[ "\$(cat /tmp/mnt/merged/append.txt)" == "Append\ned" ]]
-          umount /tmp/mnt/merged
-          umount /tmp/mnt
-          udevadm settle
-      """
+      'mkfs.ext4 -F -L overlay-ext4 /dev/vdb',
+      'mount -t ext4 /dev/vdb /tmp/mnt',
+      'mkdir -p /tmp/mnt/upper /tmp/mnt/lower /tmp/mnt/work /tmp/mnt/merged',
+      # Setup some existing files
+      'echo Replace > /tmp/mnt/lower/replace.txt',
+      'echo Append > /tmp/mnt/lower/append.txt',
+      'echo Overwrite > /tmp/mnt/lower/overwrite.txt',
+      'mount -t overlay overlay -o lowerdir=/tmp/mnt/lower,upperdir=/tmp/mnt/upper,workdir=/tmp/mnt/work /tmp/mnt/merged',
+      # Test new
+      'echo New > /tmp/mnt/merged/new.txt',
+      '[[ "$(cat /tmp/mnt/merged/new.txt)" == New ]]',
+      # Test replace
+      '[[ "$(cat /tmp/mnt/merged/replace.txt)" == Replace ]]',
+      'echo Replaced > /tmp/mnt/merged/replace-tmp.txt',
+      'mv /tmp/mnt/merged/replace-tmp.txt /tmp/mnt/merged/replace.txt',
+      '[[ "$(cat /tmp/mnt/merged/replace.txt)" == Replaced ]]',
+      # Overwrite
+      '[[ "$(cat /tmp/mnt/merged/overwrite.txt)" == Overwrite ]]',
+      'echo Overwritten > /tmp/mnt/merged/overwrite.txt',
+      '[[ "$(cat /tmp/mnt/merged/overwrite.txt)" == Overwritten ]]',
+      # Test append
+      '[[ "$(cat /tmp/mnt/merged/append.txt)" == Append ]]',
+      'echo ed >> /tmp/mnt/merged/append.txt',
+      '[[ "$(cat /tmp/mnt/merged/append.txt)" == "Append\ned" ]]',
+      'umount /tmp/mnt/merged',
+      'umount /tmp/mnt',
+      'udevadm settle',
     )
   '';
 })