diff --git a/src/generators/loadtime/GeneratorClassLoader.java b/src/generators/loadtime/GeneratorClassLoader.java
index bd4809b..da99b89 100644
--- a/src/generators/loadtime/GeneratorClassLoader.java
+++ b/src/generators/loadtime/GeneratorClassLoader.java
@@ -10,6 +10,7 @@ import java.lang.classfile.*;
 import java.lang.classfile.attribute.*;
 import java.lang.classfile.constantpool.ClassEntry;
 import java.lang.constant.ClassDesc;
+import java.lang.constant.ConstantDescs;
 import java.lang.reflect.AccessFlag;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -77,7 +78,7 @@ public class GeneratorClassLoader extends ClassLoader {
                             mb.withCode(builder::buildSourceMethodShim);
                         });
                         if(builder.shouldBeInnerClass()){
-                            innerCl.add(InnerClassInfo.of(builder.CD_this, Optional.of(clm.thisClass().asSymbol()), Optional.of(builder.CD_this.displayName()), AccessFlag.PUBLIC, AccessFlag.FINAL, AccessFlag.STATIC));
+                            innerCl.add(InnerClassInfo.of(builder.CD_this, Optional.of(clm.thisClass().asSymbol()), Optional.of(builder.CD_this.displayName()), AccessFlag.PRIVATE, AccessFlag.FINAL, AccessFlag.STATIC));
                             nestMem.add(ClassDesc.of(builder.CD_this.displayName()));
                         }
                     }else{
diff --git a/src/generators/loadtime/StateMachineBuilder.java b/src/generators/loadtime/StateMachineBuilder.java
index 00c762e..717e159 100644
--- a/src/generators/loadtime/StateMachineBuilder.java
+++ b/src/generators/loadtime/StateMachineBuilder.java
@@ -138,7 +138,7 @@ public abstract class StateMachineBuilder {
             clb.withField(STATE_NAME, ConstantDescs.CD_int, ClassFile.ACC_PRIVATE);
 
             // constructor
-            clb.withMethod(ConstantDescs.INIT_NAME, MTD_init, ClassFile.ACC_PUBLIC, mb -> mb.withCode(cob -> {
+            clb.withMethod(ConstantDescs.INIT_NAME, MTD_init, ClassFile.ACC_PRIVATE, mb -> mb.withCode(cob -> {
                 cob.aload(0).invokespecial(ConstantDescs.CD_Object, ConstantDescs.INIT_NAME, ConstantDescs.MTD_void);
                 params(1, (param, slot, type) -> {
                     cob.aload(0).loadLocal(TypeKind.from(type), slot).putfield(CD_this, param, type);
@@ -146,6 +146,8 @@ public abstract class StateMachineBuilder {
                 cob.return_();
             }));
 
+            clb.withFlags(AccessFlag.PUBLIC, AccessFlag.FINAL);
+
             buildStateMachineMethod(clb);
         });
     }