diff --git a/glcontext/egl.cpp b/glcontext/egl.cpp
index 899f3b8..cc7d12d 100644
--- a/glcontext/egl.cpp
+++ b/glcontext/egl.cpp
@@ -216,7 +216,7 @@ GLContext * meth_create_context(PyObject * self, PyObject * args, PyObject * kwa
             return NULL;
         }
 
-        EGLDeviceEXT* devices = malloc(sizeof(EGLDeviceEXT) * num_devices);
+        EGLDeviceEXT * devices = (EGLDeviceEXT *)malloc(sizeof(EGLDeviceEXT) * num_devices);
         if (!res->m_eglQueryDevicesEXT(num_devices, devices, &num_devices)) {
             PyErr_Format(PyExc_Exception, "eglQueryDevicesEXT failed (0x%x)", res->m_eglGetError());
             free(devices);
diff --git a/glcontext/empty.cpp b/glcontext/empty.cpp
index 8827a8b..da73cc3 100644
--- a/glcontext/empty.cpp
+++ b/glcontext/empty.cpp
@@ -47,7 +47,7 @@ PyMethodDef GLContext_methods[] = {
 
 PyType_Slot GLContext_slots[] = {
     {Py_tp_methods, GLContext_methods},
-    {Py_tp_dealloc, GLContext_dealloc},
+    {Py_tp_dealloc, (void *)GLContext_dealloc},
     {},
 };
 
diff --git a/glcontext/windowed.cpp b/glcontext/windowed.cpp
index fdde57e..459b59c 100644
--- a/glcontext/windowed.cpp
+++ b/glcontext/windowed.cpp
@@ -58,7 +58,7 @@ PyObject * meth_load_opengl_function(PyObject * self, PyObject * arg) {
         return NULL;
     }
     const char * name = PyUnicode_AsUTF8(arg);
-    return PyLong_FromVoidPtr(glXGetProcAddress((unsigned char *)name));
+    return PyLong_FromVoidPtr((void *)glXGetProcAddress((unsigned char *)name));
 }
 
 #endif