diff --git a/atari/plot/plot.h b/atari/plot/plot.h
index 7703c65f1..7bef5b92d 100755
--- a/atari/plot/plot.h
+++ b/atari/plot/plot.h
@@ -107,7 +107,7 @@ bool plot_lock(void);
 bool plot_unlock(void);
 bool plot_set_dimensions( int x, int y, int w, int h );
 bool plot_get_dimensions(GRECT *dst);
-float plot_get_scale();
+float plot_get_scale(void);
 bool plot_set_scale(float);
 bool plot_get_clip(struct rect * out);
 /* Get clipping for current framebuffer as GRECT */