diff --git a/features/preferences/impl/src/test/kotlin/io/element/android/features/preferences/impl/tasks/FakeComputeCacheSizeUseCase.kt b/features/preferences/impl/src/test/kotlin/io/element/android/features/preferences/impl/tasks/FakeComputeCacheSizeUseCase.kt
index fdf0d657ad..36f60eca7c 100644
--- a/features/preferences/impl/src/test/kotlin/io/element/android/features/preferences/impl/tasks/FakeComputeCacheSizeUseCase.kt
+++ b/features/preferences/impl/src/test/kotlin/io/element/android/features/preferences/impl/tasks/FakeComputeCacheSizeUseCase.kt
@@ -20,6 +20,6 @@ import io.element.android.tests.testutils.simulateLongTask
 
 class FakeComputeCacheSizeUseCase : ComputeCacheSizeUseCase {
     override suspend fun execute() = simulateLongTask {
-        0L
+        "O kB"
     }
 }