diff --git a/OLEDDisplay.h b/OLEDDisplay.h
index a6a25be5df7f96dbe43426f10ed217c3430dd340..81537a24fa54ba017715d4971fb094f6f6b3e791 100644
--- a/OLEDDisplay.h
+++ b/OLEDDisplay.h
@@ -207,7 +207,7 @@ class OLEDDisplay : public Print {
     void flipScreenVertically();
 
     // Write the buffer to the display memory
-    virtual void display(void);
+    virtual void display(void) = 0;
 
     // Clear the local pixel buffer
     void clear(void);