diff --git a/src/hack.c b/src/hack.c
index 2eb45803b..cb92b93ad 100644
--- a/src/hack.c
+++ b/src/hack.c
@@ -2545,7 +2545,7 @@ pickup_checks()
 
 /* the ',' command */
 int
-dopickup()
+dopickup(VOID_ARGS)
 {
     int count, tmpcount, ret;