diff --git a/src/main/java/gtPlusPlus/xmod/gregtech/common/tileentities/machines/multi/production/chemplant/GregtechMTE_ChemicalPlant.java b/src/main/java/gtPlusPlus/xmod/gregtech/common/tileentities/machines/multi/production/chemplant/GregtechMTE_ChemicalPlant.java
index a1c087ba7..c92cb6a44 100644
--- a/src/main/java/gtPlusPlus/xmod/gregtech/common/tileentities/machines/multi/production/chemplant/GregtechMTE_ChemicalPlant.java
+++ b/src/main/java/gtPlusPlus/xmod/gregtech/common/tileentities/machines/multi/production/chemplant/GregtechMTE_ChemicalPlant.java
@@ -563,7 +563,7 @@ protected ProcessingLogic createProcessingLogic() {
             @Override
             protected CheckRecipeResult validateRecipe(@NotNull GT_Recipe recipe) {
                 if (recipe.mSpecialValue > mSolidCasingTier) {
-                    return CheckRecipeResultRegistry.insufficientMachineTier(recipe.mSpecialValue);
+                    return CheckRecipeResultRegistry.insufficientMachineTier(recipe.mSpecialValue + 1);
                 }
                 // checks if it has a catalyst
                 ItemStack catalystInRecipe = null;