Can't call the method from the derived class when using references/pointers

[cpocol]

I'm having these two objects:

TFT_eSPI display = TFT_eSPI();
TFT_eSprite sprite = TFT_eSprite(&display);

As TFT_eSprite is derived from TFT_eSPI, I expect to easily switch between the two,

by using either

TFT_eSPI* pDisplay = &display;

or

TFT_eSPI* pDisplay = &sprite;

But calling this:

pDisplay->pushImage(x, y, w, h, data);

will always use the pushImage method from the base class.

pushImage and other methods that are inherited from the base class should be virtual in the base class.

Am I missing something? Thanks!