diff --git a/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/cargo/CargoInsulator.java b/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/cargo/CargoInsulator.java
index d96eaade22..2330acbe8f 100644
--- a/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/cargo/CargoInsulator.java
+++ b/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/cargo/CargoInsulator.java
@@ -1,5 +1,7 @@
 package io.github.thebusybiscuit.slimefun4.implementation.items.cargo;
 
+import javax.annotation.ParametersAreNonnullByDefault;
+
 import org.bukkit.inventory.ItemStack;
 
 import io.github.thebusybiscuit.slimefun4.api.items.ItemGroup;
@@ -15,6 +17,7 @@
  */
 public class CargoInsulator extends SlimefunItem {
 
+    @ParametersAreNonnullByDefault
     public CargoInsulator(ItemGroup itemGroup, SlimefunItemStack item, RecipeType recipeType, ItemStack[] recipe) {
         super(itemGroup, item, recipeType, recipe);
     }
diff --git a/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/EnergyInsulator.java b/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/EnergyInsulator.java
index 3dac28291b..7450b1cf56 100644
--- a/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/EnergyInsulator.java
+++ b/src/main/java/io/github/thebusybiscuit/slimefun4/implementation/items/electric/EnergyInsulator.java
@@ -2,6 +2,7 @@
 
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;
+import javax.annotation.ParametersAreNonnullByDefault;
 
 import org.bukkit.inventory.ItemStack;
 
@@ -24,13 +25,13 @@
  */
 public class EnergyInsulator extends SlimefunItem implements EnergyNetComponent {
 
+    @ParametersAreNonnullByDefault
     public EnergyInsulator(ItemGroup itemGroup, SlimefunItemStack item, RecipeType recipeType, ItemStack[] recipe) {
         super(itemGroup, item, recipeType, recipe);
     }
 
-    @Nonnull
     @Override
-    public EnergyNetComponentType getEnergyComponentType() {
+    public @Nonnull EnergyNetComponentType getEnergyComponentType() {
         return EnergyNetComponentType.INSULATOR;
     }