diff --git a/include/pocketpy/pocketpy.h b/include/pocketpy/pocketpy.h
index 3f298c90..3e1fc3b0 100644
--- a/include/pocketpy/pocketpy.h
+++ b/include/pocketpy/pocketpy.h
@@ -105,8 +105,8 @@ int py_getattr(const py_Ref self, py_Name name, py_Ref out);
 /// Sets the attribute of the object.
 int py_setattr(py_Ref self, py_Name name, const py_Ref val);
 
-/// Copies src's value to dst, equivalent to `*dst = *src`.
-void py_assign(const py_Ref src, py_Ref dst);
+/// Equivalent to `*dst = *src`.
+void py_assign(py_Ref dst, const py_Ref src);
 
 /************* Stack Operations *************/
 py_Ref py_gettop();
diff --git a/src/public/stackops.c b/src/public/stackops.c
index b3b7ac17..3bd24793 100644
--- a/src/public/stackops.c
+++ b/src/public/stackops.c
@@ -27,7 +27,7 @@ void py_setslot(py_Ref self, int i, const py_Ref val){
     PyObject__slots(self->_obj)[i] = *val;
 }
 
-void py_assign(const py_Ref src, py_Ref dst){
+void py_assign(py_Ref dst, const py_Ref src){
     *dst = *src;
 }