diff --git a/src/conio/ciolib.h b/src/conio/ciolib.h
index f963aa306524824fd4b526b05a4afd1b427a991c..2b2cfce89b180d90071217f65ce3c4ad678c21bd 100644
--- a/src/conio/ciolib.h
+++ b/src/conio/ciolib.h
@@ -274,7 +274,7 @@ typedef struct {
 	void	(*getcustomcursor)	(int *startline, int *endline, int *range, int *blink, int *visible);
 	void	(*setcustomcursor)	(int startline, int endline, int range, int blink, int visible);
 	void	(*setvideoflags)	(int flags);
-	int		(*getvideoflags)	();
+	int		(*getvideoflags)	(void);
 	int		*ESCDELAY;
 } cioapi_t;