diff --git a/src/main/java/supersymmetry/common/metatileentities/multi/primitive/MetaTileEntityPrimitiveSmelter.java b/src/main/java/supersymmetry/common/metatileentities/multi/primitive/MetaTileEntityPrimitiveSmelter.java
index 0ac137053..d8d05aa7f 100644
--- a/src/main/java/supersymmetry/common/metatileentities/multi/primitive/MetaTileEntityPrimitiveSmelter.java
+++ b/src/main/java/supersymmetry/common/metatileentities/multi/primitive/MetaTileEntityPrimitiveSmelter.java
@@ -62,6 +62,7 @@ protected void formStructure(PatternMatchContext context) {
                 .where('C', selfPredicate())
                 .where('O', casingPredicate().or(abilities(SuSyMultiblockAbilities.PRIMITIVE_EXPORT_ITEMS).setMaxGlobalLimited(2)))
                 .where('S', states(ModuleCore.Blocks.MASONRY_BRICK_SLAB.getDefaultState()))
+                .where(' ', air())
                 .build();
     }