diff --git a/projects/common/src/main/java/dan200/computercraft/shared/peripheral/printer/PrinterBlockEntity.java b/projects/common/src/main/java/dan200/computercraft/shared/peripheral/printer/PrinterBlockEntity.java
index deb10f0ea..f6037802a 100644
--- a/projects/common/src/main/java/dan200/computercraft/shared/peripheral/printer/PrinterBlockEntity.java
+++ b/projects/common/src/main/java/dan200/computercraft/shared/peripheral/printer/PrinterBlockEntity.java
@@ -225,7 +225,9 @@ private boolean outputPage() {
         var stack = PrintoutItem.createSingleFromTitleAndText(pageTitle, lines, colours);
         for (var slot : BOTTOM_SLOTS) {
             if (inventory.get(slot).isEmpty()) {
-                setItem(slot, stack);
+                inventory.set(slot, stack);
+                updateBlockState();
+                setChanged();
                 printing = false;
                 return true;
             }