diff --git a/core/src/mindustry/world/blocks/logic/LogicBlock.java b/core/src/mindustry/world/blocks/logic/LogicBlock.java
index 834919f4f3..ec589a9eaa 100644
--- a/core/src/mindustry/world/blocks/logic/LogicBlock.java
+++ b/core/src/mindustry/world/blocks/logic/LogicBlock.java
@@ -35,6 +35,8 @@ public class LogicBlock extends Block{
     private static final int maxLinks = 6000;
     public static final int maxNameLength = 32;
 
+    private static final IntSet usedBuildings = new IntSet();
+
     public int maxInstructionScale = 5;
     public int instructionsPerTick = 1;
     //privileged only
@@ -268,6 +270,7 @@ public class LogicBlock extends Block{
                         stream.readInt();
                     }
                 }else{
+                    usedBuildings.clear();
                     for(int i = 0; i < total; i++){
                         String name = stream.readUTF();
                         short x = stream.readShort(), y = stream.readShort();
@@ -280,6 +283,9 @@ public class LogicBlock extends Block{
                         Building build = world.build(x, y);
 
                         if(build != null){
+                            if(!usedBuildings.add(build.id)){
+                                continue;
+                            }
                             String bestName = getLinkName(build.block);
                             if(!name.startsWith(bestName)){
                                 name = findLinkName(build.block);