diff --git a/tests/test_all.cpp b/tests/test_all.cpp
index 784f620..b14e087 100644
--- a/tests/test_all.cpp
+++ b/tests/test_all.cpp
@@ -61,7 +61,9 @@ int main(int argc,
 {
 #if defined(_WIN32)
     // Setup UTF-8 input/output on Windows (does nothing on other platforms)
-    core::io::setup_utf8_console();
+    if (const auto e = core::io::setup_utf8_console(); e.has_value()) {
+        fmt::print(stderr, "Warning: {}\n", *e);
+    }
 #endif
 
     // Define the formatted help message