diff --git a/implot/core.pxd b/implot/core.pxd
deleted file mode 100644
index 3d1d4c8..0000000
--- a/implot/core.pxd
+++ /dev/null
@@ -1,19 +0,0 @@
-"""
-This file provides all C/C++ definitions that need to be shared between all
-extension modules. This is mostly for the `extra` submodule that provides
-some additional utilities that do not belong to `core`.
-"""
-cimport cimgui
-
-# cdef class _Font(object):
-#     cdef cimgui.ImFont* _ptr
-#
-#     @staticmethod
-#     cdef from_ptr(cimgui.ImFont* ptr)
-
-# allows using _ImGuiContext in plot.pyx
-cdef class _ImGuiContext(object):
-    cdef cimgui.ImGuiContext* _ptr
-
-    @staticmethod
-    cdef from_ptr(cimgui.ImGuiContext* ptr)
diff --git a/implot/plot.pyx b/implot/plot.pyx
index a3175aa..1151f37 100644
--- a/implot/plot.pyx
+++ b/implot/plot.pyx
@@ -13,7 +13,7 @@ from libc.stdlib cimport malloc, free
 
 cimport cimplot
 cimport cimgui
-cimport core
+cimport imgui.core as core
 cimport enums
 from imgui import core
 
diff --git a/setup.py b/setup.py
index e082150..9d14959 100644
--- a/setup.py
+++ b/setup.py
@@ -149,7 +149,7 @@ def backend_extras(*requirements):
         # include_dirs=['imgui', 'implot-cpp'],
         # include_dirs=['implot', 'config-cpp', 'imgui-cpp', 'ansifeed-cpp', 'implot-cpp'],
         # include_dirs=['implot', 'config-cpp', 'imgui-cpp', 'implot-cpp'],
-        include_dirs=['implot', 'imgui-cpp', 'implot-cpp'],
+        include_dirs=['implot', 'config-cpp', 'imgui-cpp', 'implot-cpp'],
     ),
 ]