diff --git a/sys/windows/stubs.c b/sys/windows/stubs.c
index c14b7a2a5..e9234dba5 100644
--- a/sys/windows/stubs.c
+++ b/sys/windows/stubs.c
@@ -208,7 +208,7 @@ set_keyhandling_via_option(void)
 }
 
 #ifdef CURSES_GRAPHICS
-struct window_procs curses_procs = {WPID(curses)};
+struct window_procs curses_procs = {WPIDMINUS(curses)};
 
 int curses_read_attrs(const char *attrs)
 {