diff --git a/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/recipes/MatteryRecipe.kt b/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/recipes/MatteryRecipe.kt
index 22ad6f598..70fc856aa 100644
--- a/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/recipes/MatteryRecipe.kt
+++ b/src/data/kotlin/ru/dbotthepony/mc/otm/datagen/recipes/MatteryRecipe.kt
@@ -144,16 +144,16 @@ class MatteryRecipe(val result: ItemLike, val count: Int = 1, val category: Reci
 		return builder
 	}
 
-	private var source: ResourceLocation? = null
+	private var upgradeSource: ResourceLocation? = null
 	private val copyPaths = ArrayList<UpgradeRecipe.Op>()
 
 	fun setUpgradeSource(source: ResourceLocation): MatteryRecipe {
-		this.source = source
+		this.upgradeSource = source
 		return this
 	}
 
 	fun setUpgradeSource(source: ItemLike): MatteryRecipe {
-		this.source = source.asItem().registryName!!
+		this.upgradeSource = source.asItem().registryName!!
 		return this
 	}
 
@@ -163,7 +163,7 @@ class MatteryRecipe(val result: ItemLike, val count: Int = 1, val category: Reci
 	}
 
 	private fun filter(consumer: Consumer<FinishedRecipe>): Consumer<FinishedRecipe> {
-		if (source != null) {
+		if (upgradeSource != null) {
 			check(copyPaths.isNotEmpty()) { "Defined upgrade recipe without nbt migration operations" }
 
 			return Consumer {
@@ -172,7 +172,7 @@ class MatteryRecipe(val result: ItemLike, val count: Int = 1, val category: Reci
 						it.serializeRecipeData(pJson)
 
 						pJson["copyPaths"] = copyPaths.stream().map { it.serialize() }.collect(JsonArrayCollector)
-						pJson["source"] = source!!.toString()
+						pJson["source"] = upgradeSource!!.toString()
 					}
 
 					override fun getType(): RecipeSerializer<*> {