diff --git a/.appveyor.yml b/.appveyor.yml
index 93fa0b48..3535ef54 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -51,11 +51,13 @@ environment:
       PLATFORM: x64
       B2_TOOLSET: msvc-14.2
       B2_CXXSTD: 20
+      B2_VARIANT: release
     - FLAVOR: Visual Studio 2019
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       PLATFORM: x86
       B2_TOOLSET: msvc-14.2
       B2_CXXSTD: 20
+      B2_VARIANT: debug
     # CMake
     - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
       CMAKE_BUILD_TYPE: Debug
diff --git a/example/timeouts.cpp b/example/timeouts.cpp
index a9e5c655..cc9e2161 100644
--- a/example/timeouts.cpp
+++ b/example/timeouts.cpp
@@ -114,13 +114,14 @@ boost::asio::awaitable<void> start_query(
         // Read all rows
         boost::mysql::row row;
         bool more_rows = true;
-        while (more_rows)
+        while (true)
         {
             timer.expires_after(TIMEOUT);
             more_rows = check_timeout(co_await (
                 timer.async_wait(use_awaitable) ||
                 result.async_read_one(row, use_awaitable)
             ));
+            if (!more_rows) break;
             print_employee(row);
         }