diff --git a/src/libCom/sydSubr.c b/src/libCom/sydSubr.c
index c18dacfd4..fb8b5ec15 100644
--- a/src/libCom/sydSubr.c
+++ b/src/libCom/sydSubr.c
@@ -99,6 +99,7 @@
 *-***************************************************************************/
 #include <genDefs.h>
 #define SYD_PRIVATE
+#define SYD_PRIVATE_DATA
 #include <sydDefs.h>
 #include <alarm.h>
 #ifndef INC_tsDefs_h