diff --git a/msvc/ecl/config.h.msvc6 b/msvc/ecl/config.h.msvc6
index b0a7490e2..c7402c673 100755
--- a/msvc/ecl/config.h.msvc6
+++ b/msvc/ecl/config.h.msvc6
@@ -84,6 +84,8 @@
 /* Foreign functions interface						*/
 #define ECL_FFI
 
+#define HAVE_WCHAR_H
+
 /* Support for Unicode strings */
 #define ECL_UNICODE @ECL_UNICODE@
 #if !ECL_UNICODE