diff --git a/Videos/OneLoneCoder_PGE_ExtensionTestGFX2D.cpp b/Videos/OneLoneCoder_PGE_ExtensionTestGFX2D.cpp
index f31ee79..0c17910 100644
--- a/Videos/OneLoneCoder_PGE_ExtensionTestGFX2D.cpp
+++ b/Videos/OneLoneCoder_PGE_ExtensionTestGFX2D.cpp
@@ -46,15 +46,15 @@
 
 	Author
 	~~~~~~
-	David Barr, aka javidx9, ©OneLoneCoder 2018
+	David Barr, aka javidx9, ©OneLoneCoder 2018
 */
 
 // Include the olcPixelGameEngine
 #define OLC_PGE_APPLICATION
 #include "olcPixelGameEngine.h"
 
-// To use an extension, just include it
-#define OLC_PGE_GRAPHICS2D
+// To use an extension, just include it (thanks MaxCE, for pointing out old definition format)
+#define OLC_PGEX_GRAPHICS2D
 #include "olcPGEX_Graphics2D.h"
 
 class TestExtension : public olc::PixelGameEngine
@@ -186,4 +186,4 @@ int main()
 		demo.Start();
 
 	return 0;
-}
\ No newline at end of file
+}