diff --git a/src/libCom/osi/os/posix/osdSpin.c b/src/libCom/osi/os/posix/osdSpin.c
index 71c34cca8..b8395dbb0 100644
--- a/src/libCom/osi/os/posix/osdSpin.c
+++ b/src/libCom/osi/os/posix/osdSpin.c
@@ -16,6 +16,7 @@
 #include <string.h>
 #include <pthread.h>
 
+#define epicsExportSharedSymbols
 #include "errlog.h"
 #include "epicsSpin.h"