diff --git a/public/pos/receipt.html b/public/pos/receipt.html
index 412cae4..08b29ce 100644
--- a/public/pos/receipt.html
+++ b/public/pos/receipt.html
@@ -750,6 +750,16 @@ function paintPrinterSettings(){
 
 paintPrinterSettings();
 paintNet();
+
+// Expose the onclick-bound functions on window — they're defined
+// inside the IIFE above so they're not visible to inline `onclick`
+// attributes (which evaluate against window). Without this the
+// "Printer: ..." row, "Save printer settings" button, "Print slip"
+// button, and "Print delivery note" button all silently do nothing.
+window.togglePrinterSettings = togglePrinterSettings;
+window.savePrinterSettings = savePrinterSettings;
+window.printThermal = printThermal;
+window.printDelivery = printDelivery;
 })();
 </script>
 <script>if("serviceWorker" in navigator){navigator.serviceWorker.register("sw.js").catch(function(){});}</script>