diff --git a/include/sot-core/time-stamp.h b/include/sot-core/time-stamp.h
index d9e349317cf08f0b83d4962d1ac1d0255c2b29c9..5e3400cd14dafac2bf022fce268b4114d5748140 100644
--- a/include/sot-core/time-stamp.h
+++ b/include/sot-core/time-stamp.h
@@ -49,7 +49,7 @@ namespace ml = maal::boost;
 /* --------------------------------------------------------------------- */
 
 #if defined (WIN32) 
-#  if defined (TimeStamp_EXPORTS)
+#  if defined (time_stamp_EXPORTS)
 #    define TimeStamp_EXPORT __declspec(dllexport)
 #  else  
 #    define TimeStamp_EXPORT __declspec(dllimport)