diff --git a/common/buildcraft/builders/schematics/SchematicPortal.java b/common/buildcraft/builders/schematics/SchematicPortal.java
index 49484776..71ac7780 100755
--- a/common/buildcraft/builders/schematics/SchematicPortal.java
+++ b/common/buildcraft/builders/schematics/SchematicPortal.java
@@ -26,6 +26,11 @@ public class SchematicPortal extends SchematicBlock {
 	public void writeToWorld(IBuilderContext context, int x, int y, int z) {
 	}
 
+	@Override
+	public boolean isValid(IBuilderContext context, int x, int y, int z) {
+		return true;
+	}
+
 	@Override
 	public void postProcessing(IBuilderContext context, int x, int y, int z) {
 		context.world().setBlock(x, y, z, Blocks.portal);
diff --git a/common/buildcraft/core/blueprints/BptBuilderBlueprint.java b/common/buildcraft/core/blueprints/BptBuilderBlueprint.java
index 75aef167..0118e601 100644
--- a/common/buildcraft/core/blueprints/BptBuilderBlueprint.java
+++ b/common/buildcraft/core/blueprints/BptBuilderBlueprint.java
@@ -128,7 +128,6 @@ public class BptBuilderBlueprint extends BptBuilderBase {
 			checkDone();
 
 			if (slot != null) {
-				postProcessing.add(slot);
 				return slot;
 			}
 		}
@@ -138,7 +137,6 @@ public class BptBuilderBlueprint extends BptBuilderBase {
 			checkDone();
 
 			if (slot != null) {
-				postProcessing.add(slot);
 				return slot;
 			}
 		}
@@ -155,6 +153,7 @@ public class BptBuilderBlueprint extends BptBuilderBase {
 
 		while (list.size() > 0) {
 			SchematicToBuild slot = list.removeFirst();
+			postProcessing.add(slot);
 
 			boolean getNext = false;