diff --git a/src/main/java/de/ellpeck/naturesaura/blocks/tiles/BlockEntityBlastFurnaceBooster.java b/src/main/java/de/ellpeck/naturesaura/blocks/tiles/BlockEntityBlastFurnaceBooster.java
index 933d9302..faf9642a 100644
--- a/src/main/java/de/ellpeck/naturesaura/blocks/tiles/BlockEntityBlastFurnaceBooster.java
+++ b/src/main/java/de/ellpeck/naturesaura/blocks/tiles/BlockEntityBlastFurnaceBooster.java
@@ -10,6 +10,7 @@ import net.minecraft.world.item.crafting.Ingredient;
 import net.minecraft.world.item.crafting.Recipe;
 import net.minecraft.world.level.block.entity.BlastFurnaceBlockEntity;
 import net.minecraft.world.level.block.state.BlockState;
+import net.minecraftforge.common.Tags;
 import net.minecraftforge.common.capabilities.ForgeCapabilities;
 import net.minecraftforge.items.IItemHandlerModifiable;
 
@@ -68,7 +69,7 @@ public class BlockEntityBlastFurnaceBooster extends BlockEntityImpl implements I
     private boolean isApplicable(List<Ingredient> ingredients) {
         for (var ing : ingredients) {
             for (var stack : ing.getItems()) {
-                if (stack.getTags().anyMatch(t -> t.location().getPath().startsWith("ores/")))
+                if (stack.is(Tags.Items.ORES) || stack.is(Tags.Items.RAW_MATERIALS))
                     return true;
             }
         }
diff --git a/src/main/java/de/ellpeck/naturesaura/blocks/tiles/BlockEntityFurnaceHeater.java b/src/main/java/de/ellpeck/naturesaura/blocks/tiles/BlockEntityFurnaceHeater.java
index e4613958..acdacc4e 100644
--- a/src/main/java/de/ellpeck/naturesaura/blocks/tiles/BlockEntityFurnaceHeater.java
+++ b/src/main/java/de/ellpeck/naturesaura/blocks/tiles/BlockEntityFurnaceHeater.java
@@ -65,8 +65,8 @@ public class BlockEntityFurnaceHeater extends BlockEntityImpl implements ITickab
                     this.level.setBlockAndUpdate(tilePos, this.level.getBlockState(tilePos).setValue(AbstractFurnaceBlock.LIT, true));
 
                 data.set(0, 200);
-                //if set higher than 199, it'll never finish because the furnace does ++ and then ==
-                data.set(2, Math.min(data.get(3) - 1, data.get(2) + 5));
+                // we leave some wiggle room for the furnace to do its own checks + the blast furnace booster
+                data.set(2, Math.min(data.get(3) - 2, data.get(2) + 5));
 
                 var spot = IAuraChunk.getHighestSpot(this.level, this.worldPosition, 20, this.worldPosition);
                 var chunk = IAuraChunk.getAuraChunk(this.level, spot);