diff --git a/src/main/java/com/tiedup/remake/worldgen/RoomThemeReloadListener.java b/src/main/java/com/tiedup/remake/worldgen/RoomThemeReloadListener.java
index d135e63..6a39ea4 100644
--- a/src/main/java/com/tiedup/remake/worldgen/RoomThemeReloadListener.java
+++ b/src/main/java/com/tiedup/remake/worldgen/RoomThemeReloadListener.java
@@ -59,8 +59,14 @@ public class RoomThemeReloadListener
             ResourceLocation fileId = entry.getKey();
             Resource resource = entry.getValue();
 
+            // Derive clean ID from file path: "tiedup:tiedup_room_themes/oubliette.json" -> "tiedup:oubliette"
+            String cleanPath = fileId.getPath()
+                .replace(DIRECTORY + "/", "")
+                .replace(".json", "");
+            ResourceLocation cleanId = new ResourceLocation(fileId.getNamespace(), cleanPath);
+
             try (InputStream input = resource.open()) {
-                RoomThemeDefinition def = RoomThemeParser.parse(input, fileId);
+                RoomThemeDefinition def = RoomThemeParser.parse(input, cleanId);
 
                 if (def != null) {
                     // Check for duplicate IDs (fileId IS the ID for room themes)