diff --git a/test/api/multithreading_fake.cpp b/test/api/multithreading_fake.cpp
index 61c32fe9423028329f541e60301e2b80835acf47..c60eff05b82d2bf70181b33514839a88ed26b95f 100644
--- a/test/api/multithreading_fake.cpp
+++ b/test/api/multithreading_fake.cpp
@@ -32,7 +32,8 @@ static kleidicv_error_t parallel_fake(kleidicv_thread_callback callback,
   // Put task_indices in random order to simulate the unpredictability of
   // multithreading.
   std::shuffle(task_indices.begin(), task_indices.end(),
-               std::minstd_rand{test::Options::seed()});
+               std::minstd_rand{static_cast<std::minstd_rand::result_type>(
+                   test::Options::seed())});
 
   for (unsigned i : task_indices) {
     unsigned task_begin = i * task_count / thread_count;