diff --git a/src/main/java/io/github/tox1cozz/mixinbooterlegacy/loader/mixin/LoadControllerMixin.java b/src/main/java/io/github/tox1cozz/mixinbooterlegacy/loader/mixin/LoadControllerMixin.java
index d39128a..445edde 100644
--- a/src/main/java/io/github/tox1cozz/mixinbooterlegacy/loader/mixin/LoadControllerMixin.java
+++ b/src/main/java/io/github/tox1cozz/mixinbooterlegacy/loader/mixin/LoadControllerMixin.java
@@ -38,12 +38,12 @@ private void beforeConstructing(LoaderState state, Object[] eventData, CallbackI
 
         MixinBooterLegacyPlugin.LOGGER.info("Instantiating all ILateMixinLoader implemented classes...");
 
-        for (ASMDataTable.ASMData asmData : asmDataTable.getAll(LateMixin.class.getName().replace('.', '/'))) {
+        for (ASMDataTable.ASMData asmData : asmDataTable.getAll(LateMixin.class.getName())) {
             modClassLoader.addFile(asmData.getCandidate().getModContainer()); // Add to path before `newInstance`
             Class<?> clazz = Class.forName(asmData.getClassName().replace('/', '.'));
             MixinBooterLegacyPlugin.LOGGER.info("Instantiating {} for its mixins.", clazz);
 
-            if (!clazz.isAssignableFrom(ILateMixinLoader.class)) {
+            if (!ILateMixinLoader.class.isAssignableFrom(clazz)) {
                 throw new MixinInitialisationError(String.format("The class %s has the LateMixin annotation, but does not implement the ILateMixinLoader interface.", clazz.getName()));
             }
 
@@ -98,4 +98,4 @@ private void beforeConstructing(LoaderState state, Object[] eventData, CallbackI
             prepareConfigsMethod.invoke(processor, env, extensions);
         }
     }
-}
\ No newline at end of file
+}