diff --git a/src/proxyface/autoproxy.hxx b/src/proxyface/autoproxy.hxx
index ee41fc1..0458a0b 100644
--- a/src/proxyface/autoproxy.hxx
+++ b/src/proxyface/autoproxy.hxx
@@ -561,7 +561,7 @@ namespace proxy {
 }
 
 #  ifdef WIN32
-#    ifdef QT_NETWORK_LIB
+#    ifdef QT_NETWORK_LIB___HAS_A_BUG /// @bug Crashes on Windows Qt 5.2.1
 //     use Qt if available
 #      include <proxyface/qtproxy.hxx>
 namespace proxy {