diff --git a/src/libCom/misc/epicsUnitTest.c b/src/libCom/misc/epicsUnitTest.c
index b3687aefa..580c32f2b 100644
--- a/src/libCom/misc/epicsUnitTest.c
+++ b/src/libCom/misc/epicsUnitTest.c
@@ -16,6 +16,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#define epicsExportSharedSymbols
 #include "epicsThread.h"
 #include "epicsMutex.h"
 #include "epicsUnitTest.h"
diff --git a/src/libCom/osi/osiClockTime.c b/src/libCom/osi/osiClockTime.c
index ea3e0c3eb..218df1361 100644
--- a/src/libCom/osi/osiClockTime.c
+++ b/src/libCom/osi/osiClockTime.c
@@ -10,6 +10,7 @@
 #include <stdio.h>
 #include <string.h>
 
+#define epicsExportSharedSymbols
 #include "epicsEvent.h"
 #include "epicsExit.h"
 #include "epicsMutex.h"