diff --git a/core/src/mindustry/world/blocks/payloads/Constructor.java b/core/src/mindustry/world/blocks/payloads/Constructor.java
index 5fe9854650..f1583a8532 100644
--- a/core/src/mindustry/world/blocks/payloads/Constructor.java
+++ b/core/src/mindustry/world/blocks/payloads/Constructor.java
@@ -8,6 +8,7 @@ import arc.util.io.*;
 import mindustry.*;
 import mindustry.world.*;
 import mindustry.world.blocks.*;
+import mindustry.world.blocks.storage.*;
 import mindustry.world.meta.*;
 
 import static mindustry.Vars.*;
@@ -40,7 +41,7 @@ public class Constructor extends BlockProducer{
     }
 
     public boolean canProduce(Block b){
-        return b.isVisible() && b.size >= minBlockSize && b.size <= maxBlockSize;
+        return b.isVisible() && b.size >= minBlockSize && b.size <= maxBlockSize && !(b instanceof CoreBlock) && !state.rules.bannedBlocks.contains(b);
     }
     
     public class ConstructorBuild extends BlockProducerBuild{