diff --git a/docs/wallpapers.md b/docs/wallpapers.md
index 67845d2..8776628 100644
--- a/docs/wallpapers.md
+++ b/docs/wallpapers.md
@@ -12,11 +12,13 @@ The wallpaper is referenced directly in `settings/plasma/default.nix`:
 
 ```nix
 workspace = {
-  wallpaper = ../../wallpapers/wallpaper.jpg;
+  wallpaper = "${../../wallpapers/wallpaper.jpg}";
   # ... other settings
 };
 ```
 
+Note: The string interpolation `"${...}"` is required to convert the path to a Nix store path string.
+
 Applied automatically on every Home Manager rebuild.
 
 ## Changing the Wallpaper
diff --git a/scripts/check-wallpaper-containment.sh b/scripts/check-wallpaper-containment.sh
new file mode 100644
index 0000000..c9ffd5e
--- /dev/null
+++ b/scripts/check-wallpaper-containment.sh
@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+# Check the actual containment wallpaper settings
+
+echo "Checking wallpaper settings in containments..."
+echo ""
+
+CONFIG="/home/ewan/.config/plasma-org.kde.plasma.desktop-appletsrc"
+
+# Find all containment IDs
+CONTAINMENTS=$(grep "^\[Containments\]\[[0-9]*\]$" "$CONFIG" | grep -o "[0-9]*")
+
+for id in $CONTAINMENTS; do
+    echo "=== Containment $id ==="
+    
+    # Check if it's a desktop containment
+    TYPE=$(grep -A 50 "^\[Containments\]\[$id\]$" "$CONFIG" | grep "^activityId=" | head -1)
+    
+    if [ -n "$TYPE" ]; then
+        echo "Type: Desktop containment"
+        echo ""
+        echo "Wallpaper config:"
+        # Get the wallpaper section
+        sed -n "/^\[Containments\]\[$id\]\[Wallpaper\]/,/^\[/p" "$CONFIG" | head -30
+        echo ""
+    fi
+done
+
+echo ""
+echo "=== Looking for Image= setting ==="
+grep -n "^Image=" "$CONFIG" || echo "No Image= setting found!"
+echo ""
+
+echo "=== Current plasmarc wallpapers section ==="
+grep -A 10 "\[Wallpapers\]" ~/.config/plasmarc
diff --git a/settings/plasma/default.nix b/settings/plasma/default.nix
index d6d6f82..d039466 100644
--- a/settings/plasma/default.nix
+++ b/settings/plasma/default.nix
@@ -137,8 +137,8 @@ in
     # ── Workspace ─────────────────────────────────────────────────────────────
     workspace = {
 
-      # Wallpaper — direct path to wallpaper.jpg.
-      wallpaper = ../../wallpapers/wallpaper.jpg;
+      # Wallpaper — direct path to wallpaper.jpg (must be string-interpolated).
+      wallpaper = "${../../wallpapers/wallpaper.jpg}";
 
       # Color scheme — from settings/config/desktop.nix.
       # Explicit here so it always wins, even if the catppuccin module changes