diff --git a/test/cube.cxx b/test/cube.cxx
index 2fc97b9b44..cca716f610 100644
--- a/test/cube.cxx
+++ b/test/cube.cxx
@@ -192,7 +192,7 @@ void exit_cb(Fl_Widget *w = NULL, void *v = NULL) {
   printf("%s\n", buffer);
   fflush(stdout);
 
-  int choice = fl_choice(buffer, "Continue", "Exit", NULL);
+  int choice = fl_choice("%s", "Continue", "Exit", NULL, buffer);
   if (choice == 1) {
     // exit program, close all windows
     done = 1;