diff --git a/src/main/scala/li/cil/oc/common/Loot.scala b/src/main/scala/li/cil/oc/common/Loot.scala
index 96f48fec1..641769c5d 100644
--- a/src/main/scala/li/cil/oc/common/Loot.scala
+++ b/src/main/scala/li/cil/oc/common/Loot.scala
@@ -117,5 +117,5 @@ object Loot extends WeightedRandomChestContent(new ItemStack(null: Item), 1, 1,
     if (disks.length > 0)
       ChestGenHooks.generateStacks(random, disks(random.nextInt(disks.length)),
         theMinimumChanceToGenerateItem, theMaximumChanceToGenerateItem)
-    else Array.empty
+    else Array.empty[ItemStack]
 }
diff --git a/src/main/scala/li/cil/oc/server/component/EEPROM.scala b/src/main/scala/li/cil/oc/server/component/EEPROM.scala
index 372415c44..5594d386b 100644
--- a/src/main/scala/li/cil/oc/server/component/EEPROM.scala
+++ b/src/main/scala/li/cil/oc/server/component/EEPROM.scala
@@ -39,7 +39,7 @@ class EEPROM extends prefab.ManagedEnvironment {
     if (!node.tryChangeBuffer(-Settings.get.eepromWriteCost)) {
       return result(Unit, "not enough energy")
     }
-    val newData = args.optByteArray(0, Array.empty)
+    val newData = args.optByteArray(0, Array.empty[Byte])
     if (newData.length > Settings.get.eepromSize) throw new IllegalArgumentException("not enough space")
     codeData = newData
     context.pause(2) // deliberately slow to discourage use as normal storage medium
@@ -85,7 +85,7 @@ class EEPROM extends prefab.ManagedEnvironment {
     if (!node.tryChangeBuffer(-Settings.get.eepromWriteCost)) {
       return result(Unit, "not enough energy")
     }
-    val newData = args.optByteArray(0, Array.empty)
+    val newData = args.optByteArray(0, Array.empty[Byte])
     if (newData.length > Settings.get.eepromDataSize) throw new IllegalArgumentException("not enough space")
     volatileData = newData
     context.pause(1) // deliberately slow to discourage use as normal storage medium
diff --git a/src/main/scala/li/cil/oc/util/ItemUtils.scala b/src/main/scala/li/cil/oc/util/ItemUtils.scala
index b4534c543..309e8480a 100644
--- a/src/main/scala/li/cil/oc/util/ItemUtils.scala
+++ b/src/main/scala/li/cil/oc/util/ItemUtils.scala
@@ -55,7 +55,7 @@ object ItemUtils {
       // we have no way of returning the fluid only (and I can't be arsed
       // to make it output fluids into fluiducts or such, sorry).
       !input.getItem.isInstanceOf[ItemBucket]).toArray
-    def getOutputSize(recipe: IRecipe) =
+    def getOutputSize(recipe: IRecipe): Double =
       if (recipe != null && recipe.getRecipeOutput != null)
         recipe.getRecipeOutput.stackSize
       else
@@ -69,11 +69,11 @@ object ItemUtils {
       case Some(recipe: ShapelessRecipes) => getFilteredInputs(recipe.recipeItems.map(_.asInstanceOf[ItemStack]), getOutputSize(recipe))
       case Some(recipe: ShapedOreRecipe) => getFilteredInputs(resolveOreDictEntries(recipe.getInput), getOutputSize(recipe))
       case Some(recipe: ShapelessOreRecipe) => getFilteredInputs(resolveOreDictEntries(recipe.getInput), getOutputSize(recipe))
-      case _ => Array.empty
+      case _ => Array.empty[ItemStack]
     }
     // Avoid positive feedback loops.
     if (ingredients.exists(ingredient => ingredient.isItemEqual(stack))) {
-      return Array.empty
+      return Array.empty[ItemStack]
     }
     // Merge equal items for size division by output size.
     val merged = mutable.ArrayBuffer.empty[ItemStack]
@@ -98,7 +98,7 @@ object ItemUtils {
   catch {
     case t: Throwable =>
       OpenComputers.log.warn("Whoops, something went wrong when trying to figure out an item's parts.", t)
-      Array.empty
+      Array.empty[ItemStack]
   }
 
   private lazy val rng = new Random()