diff --git a/UnityPy/__init__.py b/UnityPy/__init__.py
index 197e2051..a362c6d9 100644
--- a/UnityPy/__init__.py
+++ b/UnityPy/__init__.py
@@ -1,4 +1,4 @@
-__version__ = "1.9.22"
+__version__ = "1.9.23"
 
 from .environment import Environment
 from .helpers.ArchiveStorageManager import set_assetbundle_decrypt_key
diff --git a/UnityPyBoost/TypeTreeHelper.c b/UnityPyBoost/TypeTreeHelper.c
index 0d6de802..4b017926 100644
--- a/UnityPyBoost/TypeTreeHelper.c
+++ b/UnityPyBoost/TypeTreeHelper.c
@@ -702,7 +702,7 @@ TypeTreeNode_setType(TypeTreeNodeObject *self, PyObject *value, void *closure)
     if (!PyUnicode_Check(value))
     {
         PyErr_SetString(PyExc_TypeError, "The type attribute value must be a string");
-        return NULL;
+        return -1;
     }
     PyMem_Free(self->m_Type);
     char *type = PyUnicode_AsUTF8(value);
@@ -724,7 +724,7 @@ TypeTreeNode_setName(TypeTreeNodeObject *self, PyObject *value, void *closure)
     if (!PyUnicode_Check(value))
     {
         PyErr_SetString(PyExc_TypeError, "The name attribute value must be a string");
-        return NULL;
+        return -1;
     }
     PyMem_Free(self->m_Name);
     char *name = PyUnicode_AsUTF8(value);
diff --git a/manifest.in b/manifest.in
new file mode 100644
index 00000000..04762de9
--- /dev/null
+++ b/manifest.in
@@ -0,0 +1,2 @@
+recursive-include UnityPyBoost *.c
+recursive-include UnityPyBoost *.h