diff --git a/bochs-testing/plugin-test/test7-win32dll/main.cc b/bochs-testing/plugin-test/test7-win32dll/main.cc
index 872040308..394cb76e5 100644
--- a/bochs-testing/plugin-test/test7-win32dll/main.cc
+++ b/bochs-testing/plugin-test/test7-win32dll/main.cc
@@ -1,3 +1,7 @@
+#ifndef WIN32
+#  error This test is specific to Windows/cygwin/mingw.  Turn back now!
+#endif
+
 #include <windows.h>
 #include <stdio.h>
 #define MAIN_DLL_EXPORT