diff --git a/gzguts.h b/gzguts.h
index 990a4d2..6378d46 100644
--- a/gzguts.h
+++ b/gzguts.h
@@ -39,7 +39,7 @@
 #  include <io.h>
 #endif
 
-#if defined(_WIN32) || defined(__CYGWIN__)
+#if defined(_WIN32)
 #  define WIDECHAR
 #endif