diff --git a/src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/CraftingPattern.java b/src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/CraftingPattern.java
index e1d5e66d8..aec32e0b2 100755
--- a/src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/CraftingPattern.java
+++ b/src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/CraftingPattern.java
@@ -65,7 +65,7 @@ public class CraftingPattern implements ICraftingPattern {
                             if (ore.getMetadata() == OreDictionary.WILDCARD_VALUE) {
                                 ore.getItem().getSubItems(CreativeTabs.SEARCH, ores);
                             } else {
-                                ores.add(ore);
+                                ores.add(ore.copy());
                             }
                         }
                     }