diff --git a/src/misc/iocInit.c b/src/misc/iocInit.c
index 8a2346b4b..00a40ff04 100644
--- a/src/misc/iocInit.c
+++ b/src/misc/iocInit.c
@@ -272,7 +272,7 @@ static void initDevSup(void)
     }
 }
 
-void devExtend(dsxt *pdsxt)
+epicsShareFunc void devExtend(dsxt *pdsxt)
 {
     if (!pthisDevSup)
         errlogPrintf("devExtend() called outside of initDevSup()\n");