diff --git a/mobile/src/tasks/mobile-task-navigation.test.ts b/mobile/src/tasks/mobile-task-navigation.test.ts
index 5cd673c8c1c..ffdd564a531 100644
--- a/mobile/src/tasks/mobile-task-navigation.test.ts
+++ b/mobile/src/tasks/mobile-task-navigation.test.ts
@@ -1,6 +1,10 @@
-import { describe, expect, it, vi } from 'vitest'
+import { afterEach, describe, expect, it, vi } from 'vitest'
 import { mobileTasksRoute, navigateToMobileTasks } from './mobile-task-navigation'
 
+afterEach(() => {
+  vi.unstubAllGlobals()
+})
+
 describe('mobileTasksRoute', () => {
   it('builds a concrete encoded host route', () => {
     expect(mobileTasksRoute('host/1')).toBe('/h/host%2F1/tasks')
@@ -16,12 +20,11 @@ describe('mobileTasksRoute', () => {
       return 1
     })
 
-    navigateToMobileTasks({ push, replace }, 'host-1', 'github')
-    expect(push).toHaveBeenCalledWith('/h/host-1')
+    navigateToMobileTasks({ push, replace }, 'host/1', 'github')
+    expect(push).toHaveBeenCalledWith('/h/host%2F1')
     expect(replace).not.toHaveBeenCalled()
 
     nextFrame?.(0)
-    expect(replace).toHaveBeenCalledWith(mobileTasksRoute('host-1', 'github'))
-    vi.unstubAllGlobals()
+    expect(replace).toHaveBeenCalledWith(mobileTasksRoute('host/1', 'github'))
   })
 })
diff --git a/mobile/src/tasks/mobile-task-navigation.ts b/mobile/src/tasks/mobile-task-navigation.ts
index 52027d2f012..77de7596484 100644
--- a/mobile/src/tasks/mobile-task-navigation.ts
+++ b/mobile/src/tasks/mobile-task-navigation.ts
@@ -21,7 +21,7 @@ export function navigateToMobileTasks(
   provider?: TaskProvider
 ): void {
   // Why: a cold nested host navigator resolves a deep push to its index route.
-  router.push(`/h/${hostId}`)
+  router.push(`/h/${encodeURIComponent(hostId)}`)
   requestAnimationFrame(() => {
     router.replace(mobileTasksRoute(hostId, provider))
   })