diff --git a/Core/src/main/java/com/plotsquared/core/command/Set.java b/Core/src/main/java/com/plotsquared/core/command/Set.java
index 3ba095af9..fe3884e75 100644
--- a/Core/src/main/java/com/plotsquared/core/command/Set.java
+++ b/Core/src/main/java/com/plotsquared/core/command/Set.java
@@ -95,7 +95,7 @@ public class Set extends SubCommand {
 
                             if (blockType.startsWith("##")) {
                                 try {
-                                    final BlockCategory category = BlockCategory.REGISTRY.get(blockType.substring(2).toLowerCase(Locale.ROOT));
+                                    final BlockCategory category = BlockCategory.REGISTRY.get(blockType.substring(2).toLowerCase(Locale.ENGLISH));
                                     if (category == null || !category.contains(BlockTypes.get(forbiddenType))) {
                                         continue;
                                     }