diff --git a/src/ceval.h b/src/ceval.h
index 521e3079..ee884bfb 100644
--- a/src/ceval.h
+++ b/src/ceval.h
@@ -36,7 +36,7 @@ inline PyObject* VM::_run_top_frame(){
 {
 
 #if PK_ENABLE_CEVAL_CALLBACK
-#define CEVAL_STEP() byte = frame->next_bytecode(); if(_ceval_on_step) _ceval_on_step(this, frame, byte)
+#define CEVAL_STEP() byte = frame->next_bytecode(); if(_ceval_on_step) _ceval_on_step(this, frame.get(), byte)
 #else
 #define CEVAL_STEP() byte = frame->next_bytecode()
 #endif
diff --git a/src/config.h b/src/config.h
index cd8b6d96..3e9523e5 100644
--- a/src/config.h
+++ b/src/config.h
@@ -50,17 +50,19 @@
 // (not recommended to change this)
 #define PK_MAX_CO_VARNAMES          255
 
-// Hash table load factor (smaller ones mean less collision but more memory)
-// For class instance
-inline const float kInstAttrLoadFactor = 0.67f;
-// For class itself
-inline const float kTypeAttrLoadFactor = 0.5f;
+namespace pkpy{
+    // Hash table load factor (smaller ones mean less collision but more memory)
+    // For class instance
+    inline const float kInstAttrLoadFactor = 0.67f;
+    // For class itself
+    inline const float kTypeAttrLoadFactor = 0.5f;
 
-#ifdef _WIN32
-    inline const char kPlatformSep = '\\';
-#else
-    inline const char kPlatformSep = '/';
-#endif
+    #ifdef _WIN32
+        inline const char kPlatformSep = '\\';
+    #else
+        inline const char kPlatformSep = '/';
+    #endif
+}
 
 #ifdef _MSC_VER
 #pragma warning (disable:4267)
diff --git a/src/vm.h b/src/vm.h
index 70b5246f..edd40462 100644
--- a/src/vm.h
+++ b/src/vm.h
@@ -98,6 +98,7 @@ struct FrameId{
     int index;
     FrameId(std::vector<pkpy::Frame>* data, int index) : data(data), index(index) {}
     Frame* operator->() const { return &data->operator[](index); }
+    Frame* get() const { return &data->operator[](index); }
 };
 
 typedef void(*PrintFunc)(VM*, const Str&);