diff --git a/src/corelib/global/qxpfunctional.h b/src/corelib/global/qxpfunctional.h
index abe00087adb..60508f6315c 100644
--- a/src/corelib/global/qxpfunctional.h
+++ b/src/corelib/global/qxpfunctional.h
@@ -108,6 +108,23 @@ public:
         class F,
         std::enable_if_t<std::conjunction_v<
             std::negation<std::is_same<q20::remove_cvref_t<F>, function_ref_base>>,
+#ifdef Q_OS_VXWORKS
+            // The VxWorks compiler is trying to match this ctor against
+            // qxp::function_ref in lieu of using the copy-constructor, so ban
+            // matching against the equivalent qxp::function_ref here.
+            // This doesn't change anything on other platforms, so to save
+            // on compile-speed, enable it only for VxWorks:
+            std::negation<
+                std::is_same<
+                    q20::remove_cvref_t<F>,
+                    std::conditional_t<
+                        std::is_const_v<Const>,
+                        qxp::function_ref<R(ArgTypes...) const noexcept(noex)>,
+                        qxp::function_ref<R(ArgTypes...) noexcept(noex)>
+                    >
+                >
+            >,
+#endif // Q_OS_VXWORKS
             std::negation<std::is_member_pointer<std::remove_reference_t<F>>>,
             is_invocable_using<copy_const_t<Const, std::remove_reference_t<F>>&>
         >, bool> = true