diff --git a/ext/nokogiri/nokogiri.h b/ext/nokogiri/nokogiri.h
index 4c6bea855e..2d53405b3c 100644
--- a/ext/nokogiri/nokogiri.h
+++ b/ext/nokogiri/nokogiri.h
@@ -18,9 +18,11 @@
 #endif
 
 #ifdef _WIN32
+#  warning "exporting functions for windows!"
 #  define NOKOPUBFUN __declspec(dllexport)
 #  define NOKOPUBVAR __declspec(dllexport) extern
 #else
+#  warning "not exporting functions"
 #  define NOKOPUBFUN
 #  define NOKOPUBVAR extern
 #endif