diff --git a/src/libCom/osi/os/WIN32/osdTime.cpp b/src/libCom/osi/os/WIN32/osdTime.cpp
index 8aa78f70e..43f17c423 100644
--- a/src/libCom/osi/os/WIN32/osdTime.cpp
+++ b/src/libCom/osi/os/WIN32/osdTime.cpp
@@ -33,6 +33,7 @@
 //
 #define epicsExportSharedSymbols
 #include "epicsTime.h"
+#include "generalTimeSup.h"
 #include "epicsTimer.h"
 #include "errlog.h"
 #include "epicsAssert.h"