diff --git a/app/src/website/kotlin/org/thoughtcrime/securesms/onboarding/messagenotifications/FastModeAvailability.kt b/app/src/website/kotlin/org/thoughtcrime/securesms/onboarding/messagenotifications/FastModeAvailability.kt
index 43d8485bc0..0e12d72699 100644
--- a/app/src/website/kotlin/org/thoughtcrime/securesms/onboarding/messagenotifications/FastModeAvailability.kt
+++ b/app/src/website/kotlin/org/thoughtcrime/securesms/onboarding/messagenotifications/FastModeAvailability.kt
@@ -2,4 +2,11 @@ package org.thoughtcrime.securesms.onboarding.messagenotifications
 
 import android.app.Application
 
-internal fun Application.isFastModeAvailable(): Boolean = true
+/**
+ * Fast mode can never work on this flavour, however capable the device is: it binds
+ * `NoOpTokenFetcher`, whose token is permanently null, and `PushRegistrationHandler` combines on
+ * `token.filterNotNull()` — so registration is never even attempted. Reporting it unavailable also
+ * preserves the battery-optimisation prompt in `HomeViewModel`, which is gated on the user not being
+ * in fast mode and is the only mitigation left once delivery depends on `BackgroundPollWorker`.
+ */
+internal fun Application.isFastModeAvailable(): Boolean = false