diff --git a/src/main/java/dan200/computercraft/shared/peripheral/diskdrive/TileDiskDrive.java b/src/main/java/dan200/computercraft/shared/peripheral/diskdrive/TileDiskDrive.java
index 2ade633b5..a2638afa5 100644
--- a/src/main/java/dan200/computercraft/shared/peripheral/diskdrive/TileDiskDrive.java
+++ b/src/main/java/dan200/computercraft/shared/peripheral/diskdrive/TileDiskDrive.java
@@ -60,7 +60,7 @@ public final class TileDiskDrive extends TileGeneric implements DefaultInventory
     }
 
     ITextComponent customName;
-    private LockCode lockCode;
+    private LockCode lockCode = LockCode.NO_LOCK;
 
     private final Map<IComputerAccess, MountInfo> computers = new HashMap<>();
 
diff --git a/src/main/java/dan200/computercraft/shared/peripheral/printer/TilePrinter.java b/src/main/java/dan200/computercraft/shared/peripheral/printer/TilePrinter.java
index 1c03fb766..a3b56a269 100644
--- a/src/main/java/dan200/computercraft/shared/peripheral/printer/TilePrinter.java
+++ b/src/main/java/dan200/computercraft/shared/peripheral/printer/TilePrinter.java
@@ -56,7 +56,7 @@ public final class TilePrinter extends TileGeneric implements DefaultSidedInvent
     private static final int[] SIDE_SLOTS = new int[] { 0 };
 
     ITextComponent customName;
-    private LockCode lockCode;
+    private LockCode lockCode = LockCode.NO_LOCK;
 
     private final NonNullList<ItemStack> inventory = NonNullList.withSize( SLOTS, ItemStack.EMPTY );
     private final SidedCaps<IItemHandler> itemHandlerCaps =