diff --git a/src/test/validation_block_tests.cpp b/src/test/validation_block_tests.cpp
--- a/src/test/validation_block_tests.cpp
+++ b/src/test/validation_block_tests.cpp
@@ -235,9 +235,7 @@
     for (auto &t : threads) {
         t.join();
     }
-    while (GetMainSignals().CallbacksPending() > 0) {
-        UninterruptibleSleep(std::chrono::milliseconds{100});
-    }
+    SyncWithValidationInterfaceQueue();
 
     UnregisterValidationInterface(&sub);