diff --git a/src/main/java/com/cleanroommc/groovyscript/core/mixin/groovy/ModuleNodeMixin.java b/src/main/java/com/cleanroommc/groovyscript/core/mixin/groovy/ModuleNodeMixin.java
new file mode 100644
index 000000000..f097be130
--- /dev/null
+++ b/src/main/java/com/cleanroommc/groovyscript/core/mixin/groovy/ModuleNodeMixin.java
@@ -0,0 +1,60 @@
+package com.cleanroommc.groovyscript.core.mixin.groovy;
+
+import com.cleanroommc.groovyscript.GroovyScript;
+import com.cleanroommc.groovyscript.api.GroovyLog;
+import com.cleanroommc.groovyscript.sandbox.FileUtil;
+import org.codehaus.groovy.ast.ModuleNode;
+import org.codehaus.groovy.ast.PackageNode;
+import org.codehaus.groovy.control.SourceUnit;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.io.File;
+
+@Mixin(value = ModuleNode.class, remap = false)
+public abstract class ModuleNodeMixin {
+
+    @Shadow private PackageNode packageNode;
+
+    @Shadow private transient SourceUnit context;
+
+    @Inject(method = "<init>(Lorg/codehaus/groovy/control/SourceUnit;)V", at = @At("TAIL"))
+    public void init(SourceUnit context, CallbackInfo ci) {
+        // auto set package name
+        String script = context.getName();
+        String rel = FileUtil.relativize(GroovyScript.getScriptPath(), script);
+        int i = rel.lastIndexOf(File.separatorChar);
+        if (i >= 0) {
+            // inject correct package declaration into script
+            String packageName = rel.substring(0, i).replace(File.separatorChar, '.') + '.';
+            this.packageNode = new PackageNode(packageName);
+        }
+    }
+
+    @Inject(method = "setPackage", at = @At("HEAD"), cancellable = true)
+    public void setPackage(PackageNode packageNode, CallbackInfo ci) {
+        if (this.packageNode == null || this.context == null) return;
+        // package name was already set -> only copy data of new node
+        String cur = this.packageNode.getName();
+        String newName = packageNode.getName();
+        if (!cur.equals(newName)) {
+            String rel = FileUtil.relativize(GroovyScript.getScriptPath(), this.context.getName());
+            GroovyLog.get().error("Expected package {} but got {} in script {}", cur, newName, rel);
+        }
+        if (this.packageNode.getAnnotations() != null) {
+            this.packageNode.getAnnotations().clear();
+        }
+        if (packageNode.getAnnotations() != null) {
+            this.packageNode.addAnnotations(packageNode.getAnnotations());
+        }
+        this.packageNode.setMetaDataMap(null);
+        this.packageNode.copyNodeMetaData(packageNode);
+        this.packageNode.setDeclaringClass(packageNode.getDeclaringClass());
+        this.packageNode.setSynthetic(packageNode.isSynthetic());
+        this.packageNode.setSourcePosition(packageNode);
+        ci.cancel();
+    }
+}
diff --git a/src/main/java/com/cleanroommc/groovyscript/sandbox/transformer/GroovyScriptEarlyCompiler.java b/src/main/java/com/cleanroommc/groovyscript/sandbox/transformer/GroovyScriptEarlyCompiler.java
index bf1bfc33b..040d31c6f 100644
--- a/src/main/java/com/cleanroommc/groovyscript/sandbox/transformer/GroovyScriptEarlyCompiler.java
+++ b/src/main/java/com/cleanroommc/groovyscript/sandbox/transformer/GroovyScriptEarlyCompiler.java
@@ -1,11 +1,8 @@
 package com.cleanroommc.groovyscript.sandbox.transformer;
 
-import com.cleanroommc.groovyscript.GroovyScript;
-import com.cleanroommc.groovyscript.api.GroovyLog;
 import com.cleanroommc.groovyscript.compat.mods.GroovyContainer;
 import com.cleanroommc.groovyscript.compat.mods.ModSupport;
 import com.cleanroommc.groovyscript.core.mixin.groovy.ModuleNodeAccessor;
-import com.cleanroommc.groovyscript.sandbox.FileUtil;
 import org.codehaus.groovy.ast.ClassHelper;
 import org.codehaus.groovy.ast.ClassNode;
 import org.codehaus.groovy.ast.MethodNode;
@@ -24,7 +21,6 @@
 import org.codehaus.groovy.syntax.Token;
 import org.codehaus.groovy.syntax.Types;
 
-import java.io.File;
 import java.util.List;
 
 public class GroovyScriptEarlyCompiler extends CompilationCustomizer {
@@ -35,19 +31,7 @@ public GroovyScriptEarlyCompiler() {
 
     @Override
     public void call(SourceUnit source, GeneratorContext context, ClassNode classNode) throws CompilationFailedException {
-        String root = GroovyScript.getScriptPath();
-        String script = source.getName();
         ModuleNode module = classNode.getModule();
-        String rel = FileUtil.relativize(root, script);
-        int i = rel.lastIndexOf(File.separatorChar);
-        if (i >= 0) {
-            // inject correct package declaration into script
-            String packageName = rel.substring(0, i).replace(File.separatorChar, '.') + '.';
-            if (module.getPackage() != null && !module.getPackage().getName().equals(packageName)) {
-                GroovyLog.get().error("Expected package {} but got {} in script {}", packageName, module.getPackage().getName(), rel);
-            }
-            module.setPackageName(packageName);
-        }
         List<MethodNode> methods = module.getClasses().get(0).getMethods("run");
         if (methods.isEmpty()) return; // class scripts don't have a run method
         BlockStatement scriptStatement = (BlockStatement) methods.get(0).getCode();
diff --git a/src/main/resources/mixin.groovyscript.json b/src/main/resources/mixin.groovyscript.json
index 5fb8103ae..79cfe2a83 100644
--- a/src/main/resources/mixin.groovyscript.json
+++ b/src/main/resources/mixin.groovyscript.json
@@ -29,6 +29,7 @@
     "groovy.Java8Mixin",
     "groovy.MetaClassImplMixin",
     "groovy.ModuleNodeAccessor",
+    "groovy.ModuleNodeMixin",
     "loot.LoadTableEventMixin",
     "loot.LootPoolAccessor",
     "loot.LootTableAccessor",
@@ -36,6 +37,6 @@
   ],
   "client": [
     "DefaultResourcePackAccessor",
-    "GuiCreateWorldMixin",
+    "GuiCreateWorldMixin"
   ]
-}
\ No newline at end of file
+}