diff --git a/src/widgets/dialogs/qcolordialog.cpp b/src/widgets/dialogs/qcolordialog.cpp
index 4aa680af613..be60ea60b0c 100644
--- a/src/widgets/dialogs/qcolordialog.cpp
+++ b/src/widgets/dialogs/qcolordialog.cpp
@@ -1851,7 +1851,7 @@ void QColorDialogPrivate::_q_addCustom()
     QColorDialogOptions::setCustomColor(nextCust, cs->currentColor());
     if (custom)
         custom->update();
-    nextCust = (nextCust+1) % 16;
+    nextCust = (nextCust+1) % QColorDialogOptions::customColorCount();
 }
 
 void QColorDialogPrivate::retranslateStrings()