diff --git a/__tests__/pure-utils.js b/__tests__/pure-utils.js
index 5e23d2ac..2d138da5 100644
--- a/__tests__/pure-utils.js
+++ b/__tests__/pure-utils.js
@@ -10,7 +10,7 @@ import pathToAction from '../src/pure-utils/pathToAction'
 import actionToPath from '../src/pure-utils/actionToPath'
 import changePageTitle from '../src/pure-utils/changePageTitle'
 
-import { NOT_FOUND } from '../src/index'
+import { NOT_FOUND, addRoutes } from '../src/index'
 
 beforeEach(() => {
   window.SSRtest = false
@@ -510,6 +510,159 @@ describe('confirmLeave()', () => {
     expect(history.location.pathname).toEqual('/first')
   })
 
+  it('can block leaving after addRoutes if confirmLeave was missing on init', () => {
+    const firstRouteName = 'FIRST'
+
+    const firstRouteOptions = {
+      path: '/first'
+    }
+
+    const routesMap = {
+      [firstRouteName]: firstRouteOptions,
+      SECOND: '/second'
+    }
+
+    const displayConfirmLeave = jest.fn()
+    const options = { displayConfirmLeave }
+    const { store, history } = setupAll('/first', options, { routesMap })
+    const confirmLeave = jest.fn((state, action) => 'blocked')
+
+    store.dispatch(
+      addRoutes({
+        [firstRouteName]: {
+          ...firstRouteOptions,
+          confirmLeave
+        }
+      })
+    )
+
+    store.dispatch({ type: 'SECOND' })
+
+    const { type } = store.getState().location
+    expect(type).toEqual(firstRouteName)
+    expect(displayConfirmLeave).toBeCalled()
+    expect(history.location.pathname).toEqual('/first')
+    expect(confirmLeave).toBeCalled()
+  })
+
+  it('can block leaving after addRoutes if confirmLeave was passing on init', () => {
+    const firstRouteName = 'FIRST'
+
+    const firstRouteOptions = {
+      path: '/first'
+    }
+
+    const prevConfirmLeave = jest.fn((state, action) => undefined)
+    const nextConfirmLeave = jest.fn((state, action) => 'blocked')
+
+    const routesMap = {
+      [firstRouteName]: {
+        ...firstRouteOptions,
+        confirmLeave: prevConfirmLeave
+      },
+      SECOND: '/second'
+    }
+
+    const displayConfirmLeave = jest.fn()
+    const options = { displayConfirmLeave }
+    const { store, history } = setupAll('/first', options, { routesMap })
+
+    store.dispatch(
+      addRoutes({
+        [firstRouteName]: {
+          ...firstRouteOptions,
+          confirmLeave: nextConfirmLeave
+        }
+      })
+    )
+
+    store.dispatch({ type: 'SECOND' })
+
+    const { type } = store.getState().location
+    expect(type).toEqual(firstRouteName)
+    expect(displayConfirmLeave).toBeCalled()
+    expect(history.location.pathname).toEqual('/first')
+    expect(prevConfirmLeave).not.toBeCalled()
+    expect(nextConfirmLeave).toBeCalled()
+  })
+
+  it('can unblock leaving after addRoutes removing blocking confirmLeave', () => {
+    const firstRouteName = 'FIRST'
+
+    const firstRouteOptions = {
+      path: '/first'
+    }
+
+    const confirmLeave = jest.fn((state, action) => 'blocked')
+
+    const routesMap = {
+      [firstRouteName]: {
+        ...firstRouteOptions,
+        confirmLeave
+      },
+      SECOND: '/second'
+    }
+
+    const displayConfirmLeave = jest.fn()
+    const options = { displayConfirmLeave }
+    const { store, history } = setupAll('/first', options, { routesMap })
+
+    store.dispatch(
+      addRoutes({
+        [firstRouteName]: firstRouteOptions
+      })
+    )
+
+    store.dispatch({ type: 'SECOND' })
+
+    const { type } = store.getState().location
+    expect(type).toEqual('SECOND')
+    expect(displayConfirmLeave).not.toBeCalled()
+    expect(history.location.pathname).toEqual('/second')
+    expect(confirmLeave).not.toBeCalled()
+  })
+
+  it('can unblock leaving after addRoutes if confirmLeave was blocking on init', () => {
+    const firstRouteName = 'FIRST'
+
+    const firstRouteOptions = {
+      path: '/first'
+    }
+
+    const prevConfirmLeave = jest.fn((state, action) => 'blocked')
+    const nextConfirmLeave = jest.fn((state, action) => undefined)
+
+    const routesMap = {
+      [firstRouteName]: {
+        ...firstRouteOptions,
+        confirmLeave: prevConfirmLeave
+      },
+      SECOND: '/second'
+    }
+
+    const displayConfirmLeave = jest.fn()
+    const options = { displayConfirmLeave }
+    const { store, history } = setupAll('/first', options, { routesMap })
+
+    store.dispatch(
+      addRoutes({
+        [firstRouteName]: {
+          ...firstRouteOptions,
+          confirmLeave: nextConfirmLeave
+        }
+      })
+    )
+
+    store.dispatch({ type: 'SECOND' })
+
+    const { type } = store.getState().location
+    expect(type).toEqual('SECOND')
+    expect(displayConfirmLeave).not.toBeCalled()
+    expect(history.location.pathname).toEqual('/second')
+    expect(prevConfirmLeave).not.toBeCalled()
+    expect(nextConfirmLeave).toBeCalled()
+  })
+
   it('can leave throws (React Native where window.confirm does not exist)', () => {
     global.confirm = undefined
 
diff --git a/src/connectRoutes.js b/src/connectRoutes.js
index 3ff0b205..d753e12d 100644
--- a/src/connectRoutes.js
+++ b/src/connectRoutes.js
@@ -16,6 +16,7 @@ import pathnamePlusSearch from './pure-utils/pathnamePlusSearch'
 import canUseDom from './pure-utils/canUseDom'
 
 import {
+  clearBlocking,
   createConfirm,
   confirmUI,
   setDisplayConfirmLeave,
@@ -230,8 +231,32 @@ export default (routesMap: RoutesMap = {}, options: Options = {}) => {
 
     // code-splitting functionliaty to add routes after store is initially configured
     if (action.type === ADD_ROUTES) {
+      const { type } = selectLocationState(store.getState())
+      const route = routesMap[type]
+
       routesMap = { ...routesMap, ...action.payload.routes }
-      return next(action)
+
+      const result = next(action)
+      const nextRoute = routesMap[type]
+
+      if (route !== nextRoute) {
+        if (_confirm !== null) {
+          clearBlocking()
+        }
+
+        if (typeof nextRoute === 'object' && nextRoute.confirmLeave) {
+          _confirm = createConfirm(
+            nextRoute.confirmLeave,
+            store,
+            selectLocationState,
+            history,
+            querySerializer,
+            () => (_confirm = null)
+          )
+        }
+      }
+
+      return result
     }
 
     // navigation transformation specific to React Navigation
@@ -571,7 +596,7 @@ export default (routesMap: RoutesMap = {}, options: Options = {}) => {
   _selectLocationState = selectLocationState
 
   let _initialDispatch
-  let _confirm
+  let _confirm = null
 
   _updateScroll = (performedByUser: boolean = true) => {
     if (scrollBehavior) {
diff --git a/src/pure-utils/confirmLeave.js b/src/pure-utils/confirmLeave.js
index e295b284..631af9ce 100644
--- a/src/pure-utils/confirmLeave.js
+++ b/src/pure-utils/confirmLeave.js
@@ -18,7 +18,7 @@ let _unblock
 let _removeConfirmBlocking
 let _displayConfirmLeave
 
-const clearBlocking = () => {
+export const clearBlocking = () => {
   _unblock && _unblock()
   _removeConfirmBlocking && _removeConfirmBlocking()
 }