diff --git a/core/src/mindustry/mod/ContentParser.java b/core/src/mindustry/mod/ContentParser.java
index 3e5ca141e2..1279a98ea4 100644
--- a/core/src/mindustry/mod/ContentParser.java
+++ b/core/src/mindustry/mod/ContentParser.java
@@ -275,15 +275,6 @@ public class ContentParser{
                 if(value.has("requirements")){
                     JsonValue rec = value.remove("requirements");
 
-                    //intermediate class for parsing
-                    class UnitReq{
-                        public Block block;
-                        public ItemStack[] requirements = {};
-                        @Nullable
-                        public UnitType previous;
-                        public float time = 60f * 10f;
-                    }
-
                     UnitReq req = parser.readValue(UnitReq.class, rec);
 
                     if(req.block instanceof Reconstructor r){
@@ -732,4 +723,13 @@ public class ContentParser{
         T parse(String mod, String name, JsonValue value) throws Exception;
     }
 
+    //intermediate class for parsing
+    static class UnitReq{
+        public Block block;
+        public ItemStack[] requirements = {};
+        @Nullable
+        public UnitType previous;
+        public float time = 60f * 10f;
+    }
+
 }
diff --git a/core/src/mindustry/world/blocks/campaign/Accelerator.java b/core/src/mindustry/world/blocks/campaign/Accelerator.java
index b5a33bc2d3..6f998ccd8f 100644
--- a/core/src/mindustry/world/blocks/campaign/Accelerator.java
+++ b/core/src/mindustry/world/blocks/campaign/Accelerator.java
@@ -21,7 +21,7 @@ public class Accelerator extends Block{
     public @Load("launch-arrow") TextureRegion arrowRegion;
 
     public Block launching = Blocks.coreNucleus;
-    public int[] capacities;
+    public int[] capacities = {};
 
     public Accelerator(String name){
         super(name);
diff --git a/core/src/mindustry/world/blocks/units/Reconstructor.java b/core/src/mindustry/world/blocks/units/Reconstructor.java
index c80cb35b83..b48f4741b6 100644
--- a/core/src/mindustry/world/blocks/units/Reconstructor.java
+++ b/core/src/mindustry/world/blocks/units/Reconstructor.java
@@ -24,7 +24,7 @@ import static mindustry.Vars.*;
 public class Reconstructor extends UnitBlock{
     public float constructTime = 60 * 2;
     public Seq<UnitType[]> upgrades = new Seq<>();
-    public int[] capacities;
+    public int[] capacities = {};
 
     public Reconstructor(String name){
         super(name);
diff --git a/core/src/mindustry/world/blocks/units/UnitFactory.java b/core/src/mindustry/world/blocks/units/UnitFactory.java
index 798c6fe26e..f6555dcc2f 100644
--- a/core/src/mindustry/world/blocks/units/UnitFactory.java
+++ b/core/src/mindustry/world/blocks/units/UnitFactory.java
@@ -24,7 +24,7 @@ import mindustry.world.consumers.*;
 import mindustry.world.meta.*;
 
 public class UnitFactory extends UnitBlock{
-    public int[] capacities;
+    public int[] capacities = {};
 
     public Seq<UnitPlan> plans = new Seq<>(4);