diff --git a/src/popupmnu.c b/src/popupmnu.c
index 2f5e7dc..b9d8e60 100644
--- a/src/popupmnu.c
+++ b/src/popupmnu.c
@@ -30,7 +30,7 @@
 
 static int pum_do_redraw = FALSE;	/* do redraw anyway */
 
-static int pum_set_selected __ARGS((int n, int repeat));
+static int pum_set_selected(int n, int repeat);
 
 #define PUM_DEF_HEIGHT 10
 #define PUM_DEF_WIDTH  15