diff --git a/lib/components/Button/ButtonIcon.vue b/lib/components/Button/ButtonIcon.vue
index c5468225..d271c6e3 100644
--- a/lib/components/Button/ButtonIcon.vue
+++ b/lib/components/Button/ButtonIcon.vue
@@ -264,8 +264,7 @@ const props = withDefaults(defineProps<ButtonIconProps>(), {
   tag: 'button',
   type: 'button',
   loadingDuration: '1s',
-  tooltipPlacement: 'top',
-  tooltipDelay: () => ({ show: 0, hide: 0 }),
+
   // Vue defaults an absent `Boolean`-typed prop to `false` unless a default
   // is given explicitly. Left unset, that silently forwards `pressed: false`
   // to BButton, which switches it into toggle-button mode: it then flips its
diff --git a/tests/unit/components/Button/ButtonIconTooltip.spec.ts b/tests/unit/components/Button/ButtonIconTooltip.spec.ts
new file mode 100644
index 00000000..b024cdcd
--- /dev/null
+++ b/tests/unit/components/Button/ButtonIconTooltip.spec.ts
@@ -0,0 +1,46 @@
+import { config, mount } from '@vue/test-utils'
+import { describe, expect, it } from 'vitest'
+import { BPopover, BTooltip, createBootstrap } from 'bootstrap-vue-next'
+import ButtonIcon from '@/components/Button/ButtonIcon.vue'
+import { i18n } from '@/i18n'
+
+// The props ButtonIcon actually hands to its BTooltip, as seen on the vnode.
+// bootstrap-vue-next only falls back to a globally configured default when a
+// prop is absent from the vnode, so anything set here is a default callers
+// cannot override globally.
+const tooltipVNodeProps = (props: Record<string, unknown>) => {
+  const wrapper = mount(ButtonIcon, { props: { label: 'Expand', hideLabel: true, ...props } })
+  return wrapper.findComponent(BTooltip).vm.$.vnode.props ?? {}
+}
+
+describe('ButtonIcon.vue tooltip', () => {
+  it('leaves the delay unset so a global BTooltip default applies', () => {
+    expect(tooltipVNodeProps({}).delay).toBeUndefined()
+  })
+
+  it('leaves the placement unset so a global BTooltip default applies', () => {
+    expect(tooltipVNodeProps({}).placement).toBeUndefined()
+  })
+
+  it('still forwards an explicit delay', () => {
+    const delay = { show: 3000, hide: 0 }
+    expect(tooltipVNodeProps({ tooltipDelay: delay }).delay).toStrictEqual(delay)
+  })
+
+  it('still forwards an explicit placement', () => {
+    expect(tooltipVNodeProps({ tooltipPlacement: 'right' }).placement).toBe('right')
+  })
+
+  it('picks up a globally configured BTooltip delay', () => {
+    const delay = { show: 3000, hide: 0 }
+    // Swap the suite-wide bootstrap plugin rather than adding a second one,
+    // which Vue would reject as already applied.
+    const plugins = config.global.plugins
+    config.global.plugins = [i18n, createBootstrap({ components: { BTooltip: { delay } } })]
+    const wrapper = mount(ButtonIcon, { props: { label: 'Expand', hideLabel: true } })
+    config.global.plugins = plugins
+    // BTooltip resolves the global default, then spreads the outcome onto the
+    // BPopover it renders, which is where the delay is finally honoured.
+    expect(wrapper.findComponent(BPopover).vm.$.vnode.props?.delay).toStrictEqual(delay)
+  })
+})