diff --git a/src/main/java/appeng/parts/misc/PartInterface.java b/src/main/java/appeng/parts/misc/PartInterface.java
index 87c79919a..781443116 100644
--- a/src/main/java/appeng/parts/misc/PartInterface.java
+++ b/src/main/java/appeng/parts/misc/PartInterface.java
@@ -305,6 +305,7 @@ public class PartInterface extends PartBasicState implements IGridTickable, ISto
             PlayerMainInvWrapper playerInv = new PlayerMainInvWrapper(player.inventory);
             final IMaterials materials = AEApi.instance().definitions().materials();
             int missingPatternsToEncode = 0;
+            int amountPatternSlots = 8 + this.getInstalledUpgrades(Upgrades.PATTERN_EXPANSION) * 9;
 
             for (int i = 0; i < inv.getSlots(); i++) {
                 if (target.getStackInSlot(i).getItem() instanceof ItemEncodedPattern) {
@@ -316,7 +317,7 @@ public class PartInterface extends PartBasicState implements IGridTickable, ISto
                 }
             }
 
-            for (int x = 0; x < tmp.getSlots(); x++) {
+            for (int x = 0; x < amountPatternSlots; x++) {
                 if (!tmp.getStackInSlot(x).isEmpty()) {
                     boolean found = false;
                     for (int i = 0; i < playerInv.getSlots(); i++) {
diff --git a/src/main/java/appeng/tile/misc/TileInterface.java b/src/main/java/appeng/tile/misc/TileInterface.java
index a900e9dc8..8a2f9f4c2 100644
--- a/src/main/java/appeng/tile/misc/TileInterface.java
+++ b/src/main/java/appeng/tile/misc/TileInterface.java
@@ -343,6 +343,7 @@ public class TileInterface extends AENetworkInvTile implements IGridTickable, II
             PlayerMainInvWrapper playerInv = new PlayerMainInvWrapper(player.inventory);
             final IMaterials materials = AEApi.instance().definitions().materials();
             int missingPatternsToEncode = 0;
+            int amountPatternSlots = 8 + this.getInstalledUpgrades(Upgrades.PATTERN_EXPANSION) * 9;
 
             for (int i = 0; i < inv.getSlots(); i++) {
                 if (target.getStackInSlot(i).getItem() instanceof ItemEncodedPattern) {
@@ -354,8 +355,7 @@ public class TileInterface extends AENetworkInvTile implements IGridTickable, II
                 }
             }
 
-
-            for (int x = 0; x < tmp.getSlots(); x++) {
+            for (int x = 0; x < amountPatternSlots; x++) {
                 if (!tmp.getStackInSlot(x).isEmpty()) {
                     boolean found = false;
                     for (int i = 0; i < playerInv.getSlots(); i++) {
@@ -371,6 +371,7 @@ public class TileInterface extends AENetworkInvTile implements IGridTickable, II
                     }
                 }
             }
+
             if (Platform.isServer() && missingPatternsToEncode > 0) {
                 player.sendMessage(PlayerMessages.MissingPatternsToEncode.get());
             }