diff --git a/src/main/java/com/raoulvdberge/refinedstorage/api/autocrafting/ICraftingPatternProvider.java b/src/main/java/com/raoulvdberge/refinedstorage/api/autocrafting/ICraftingPatternProvider.java
index b30c48f69..852af9c2f 100755
--- a/src/main/java/com/raoulvdberge/refinedstorage/api/autocrafting/ICraftingPatternProvider.java
+++ b/src/main/java/com/raoulvdberge/refinedstorage/api/autocrafting/ICraftingPatternProvider.java
@@ -14,7 +14,7 @@ public interface ICraftingPatternProvider {
      * Creates a crafting pattern.
      *
      * @param world     the world
-     * @param stack     the pattern stack
+     * @param stack     the pattern stack, the implementor needs to copy it
      * @param container the {@link ICraftingPatternContainer} where the pattern is in
      * @return the crafting pattern
      */
diff --git a/src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/node/NetworkNodeCrafter.java b/src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/node/NetworkNodeCrafter.java
index 1596592a9..1901e89d1 100755
--- a/src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/node/NetworkNodeCrafter.java
+++ b/src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/node/NetworkNodeCrafter.java
@@ -63,8 +63,7 @@ public class NetworkNodeCrafter extends NetworkNode implements ICraftingPatternC
             ItemStack patternStack = patterns.getStackInSlot(i);
 
             if (!patternStack.isEmpty()) {
-                // We copy the pattern stack because if we remove it from the inventory, the crafting task will use a pattern with an invalid stack...
-                ICraftingPattern pattern = ((ICraftingPatternProvider) patternStack.getItem()).create(world, patternStack.copy(), this);
+                ICraftingPattern pattern = ((ICraftingPatternProvider) patternStack.getItem()).create(world, patternStack, this);
 
                 if (pattern.isValid()) {
                     actualPatterns.add(pattern);
diff --git a/src/main/java/com/raoulvdberge/refinedstorage/item/ItemPattern.java b/src/main/java/com/raoulvdberge/refinedstorage/item/ItemPattern.java
index a38eae241..e2cf07314 100755
--- a/src/main/java/com/raoulvdberge/refinedstorage/item/ItemPattern.java
+++ b/src/main/java/com/raoulvdberge/refinedstorage/item/ItemPattern.java
@@ -202,6 +202,7 @@ public class ItemPattern extends ItemBase implements ICraftingPatternProvider {
     @Override
     @Nonnull
     public ICraftingPattern create(World world, ItemStack stack, ICraftingPatternContainer container) {
-        return new CraftingPattern(world, container, stack);
+        // We copy the pattern stack because if we remove it from the inventory, the crafting task will use a pattern with an invalid stack...
+        return new CraftingPattern(world, container, stack.copy());
     }
 }