diff --git a/core/src/mindustry/content/Blocks.java b/core/src/mindustry/content/Blocks.java
index e4863ee4a9..4019daad98 100644
--- a/core/src/mindustry/content/Blocks.java
+++ b/core/src/mindustry/content/Blocks.java
@@ -6883,7 +6883,7 @@ public class Blocks{
         }};
 
         largeCanvas = new CanvasBlock("large-canvas"){{
-            requirements(Category.logic, BuildVisibility.shown, with(Items.silicon, 15, Items.beryllium, 15, Items.tungsten, 10));
+            requirements(Category.logic, BuildVisibility.shown, with(Items.silicon, 15, Items.beryllium, 15, Items.surgeAlloy, 5));
 
             canvasSize = 24;
             padding = 7f / 4f * 2f;
diff --git a/core/src/mindustry/content/ErekirTechTree.java b/core/src/mindustry/content/ErekirTechTree.java
index c28ad6875f..f7b8317b21 100644
--- a/core/src/mindustry/content/ErekirTechTree.java
+++ b/core/src/mindustry/content/ErekirTechTree.java
@@ -95,7 +95,9 @@ public class ErekirTechTree{
                     });
 
                     node(reinforcedMessage, Seq.with(new OnSector(aegis)), () -> {
-                        node(canvas);
+                        node(canvas, () -> {
+                            node(largeCanvas);
+                        });
                     });
                 });