diff --git a/kitty/cursor.c b/kitty/cursor.c
index f44724411..4f433b439 100644
--- a/kitty/cursor.c
+++ b/kitty/cursor.c
@@ -134,3 +134,4 @@ copy(Cursor *self, PyObject UNUSED *args) {
     return (PyObject*)ans;
 }
 
+INIT_TYPE(Cursor)
diff --git a/kitty/data-types.c b/kitty/data-types.c
index 0610e6bae..b4885ac0e 100644
--- a/kitty/data-types.c
+++ b/kitty/data-types.c
@@ -6,10 +6,9 @@
  */
 
 #include "data-types.h"
-
-extern PyTypeObject LineBuf_Type;
-extern PyTypeObject Cursor_Type;
-extern PyTypeObject Line_Type;
+extern int init_LineBuf(PyObject *);
+extern int init_Cursor(PyObject *);
+extern int init_Line(PyObject *);
 
 static PyMethodDef module_methods[] = {
     {NULL, NULL, 0, NULL}        /* Sentinel */
@@ -28,19 +27,13 @@ PyInit_fast_data_types(void) {
     PyObject *m;
 
 
-    if (PyType_Ready(&LineBuf_Type) < 0) return NULL;
-    if (PyType_Ready(&Cursor_Type) < 0) return NULL;
-    if (PyType_Ready(&Line_Type) < 0) return NULL;
     m = PyModule_Create(&module);
     if (m == NULL) return NULL;
 
     if (m != NULL) {
-        Py_INCREF(&LineBuf_Type);
-        PyModule_AddObject(m, "LineBuf", (PyObject *)&LineBuf_Type);
-        Py_INCREF(&Cursor_Type);
-        PyModule_AddObject(m, "Cursor", (PyObject *)&Cursor_Type);
-        Py_INCREF(&Line_Type);
-        PyModule_AddObject(m, "Line", (PyObject *)&Line_Type);
+        if (!init_LineBuf(m)) return NULL;
+        if (!init_Line(m)) return NULL;
+        if (!init_Cursor(m)) return NULL;
     }
 
     return m;
diff --git a/kitty/data-types.h b/kitty/data-types.h
index 6e48c6781..1c30ecba6 100644
--- a/kitty/data-types.h
+++ b/kitty/data-types.h
@@ -47,6 +47,14 @@ typedef unsigned int index_type;
 
 #define METHOD(name, arg_type) {#name, (PyCFunction)name, arg_type, name##_doc},
 
+#define INIT_TYPE(type) \
+    int init_##type(PyObject *module) {\
+        if (PyType_Ready(&type##_Type) < 0) return 0; \
+        if (PyModule_AddObject(module, #type, (PyObject *)&type##_Type) != 0) return 0; \
+        Py_INCREF(&type##_Type); \
+        return 1; \
+    }
+
 typedef struct {
     PyObject_HEAD
 
@@ -83,3 +91,5 @@ typedef struct {
     uint32_t fg, bg, decoration_fg;
 
 } Cursor;
+
+Line *alloc_line();
diff --git a/kitty/line-buf.c b/kitty/line-buf.c
index 12ed16772..c4f7b2276 100644
--- a/kitty/line-buf.c
+++ b/kitty/line-buf.c
@@ -6,7 +6,6 @@
  */
 
 #include "data-types.h"
-extern PyTypeObject Line_Type;
 
 static inline void
 clear_chars_to_space(LineBuf* linebuf, index_type y) {
@@ -39,7 +38,7 @@ new(PyTypeObject *type, PyObject *args, PyObject UNUSED *kwds) {
         self->buf = PyMem_Calloc(xnum * ynum, CELL_SIZE);
         self->line_map = PyMem_Calloc(ynum, sizeof(index_type));
         self->continued_map = PyMem_Calloc(ynum, sizeof(uint8_t));
-        self->line = (Line*)PyType_GenericAlloc(&Line_Type, 0);
+        self->line = alloc_line();
         if (self->buf == NULL || self->line_map == NULL || self->continued_map == NULL || self->line == NULL) {
             PyErr_NoMemory();
             PyMem_Free(self->buf); PyMem_Free(self->line_map); PyMem_Free(self->continued_map); Py_XDECREF(self->line);
@@ -93,7 +92,7 @@ static PyMethodDef methods[] = {
     {NULL}  /* Sentinel */
 };
 
-PyTypeObject LineBuf_Type = {
+static PyTypeObject LineBuf_Type = {
     PyVarObject_HEAD_INIT(NULL, 0)
     .tp_name = "fast_data_types.LineBuf",
     .tp_basicsize = sizeof(LineBuf),
@@ -103,5 +102,7 @@ PyTypeObject LineBuf_Type = {
     .tp_methods = methods,
     .tp_new = new
 };
+
+INIT_TYPE(LineBuf)
 // }}
 
diff --git a/kitty/line.c b/kitty/line.c
index 3be832611..e2319d3e5 100644
--- a/kitty/line.c
+++ b/kitty/line.c
@@ -203,7 +203,7 @@ static PyMethodDef methods[] = {
     {NULL}  /* Sentinel */
 };
 
-PyTypeObject Line_Type = {
+static PyTypeObject Line_Type = {
     PyVarObject_HEAD_INIT(NULL, 0)
     .tp_name = "fast_data_types.Line",
     .tp_basicsize = sizeof(Line),
@@ -215,6 +215,10 @@ PyTypeObject Line_Type = {
     .tp_methods = methods,
     .tp_new = new
 };
+
+Line *alloc_line() {
+    return (Line*)PyType_GenericAlloc(&Line_Type, 0);
+}
 // }}
  
 static PyObject*
@@ -234,4 +238,4 @@ copy_char(Line* self, PyObject *args) {
     Py_RETURN_NONE;
 }
 
-
+INIT_TYPE(Line)