@@ -61,9 +61,10 @@ ppu_write(Ppu *p, Uint8 layer, Uint16 x, Uint16 y, Uint8 color)

 		Uint8 pix = p->pixels[row];

 		Uint8 mask = ~(0x3 << shift);

 		Uint8 pixnew = (pix & mask) + (color << shift);

-		p->pixels[row] = pixnew;

-		if(pix != pixnew)

+		if(pix != pixnew){

+			p->pixels[row] = pixnew;

 			p->reqdraw = 1;

+		}

 	}

 }