diff --git a/src/libCom/ipAddrToA.h b/src/libCom/ipAddrToA.h
index ae53c1d14..9247208bc 100644
--- a/src/libCom/ipAddrToA.h
+++ b/src/libCom/ipAddrToA.h
@@ -9,6 +9,9 @@ epicsShareFunc void epicsShareAPI
 	ipAddrToA(const struct sockaddr_in *pInetAddr, 
 		char *pBuf, const unsigned bufSize);
 
+epicsShareFunc int epicsShareAPI 
+	aToIPAddr(const char *pAddrString, unsigned short defaultPort, struct sockaddr_in *pIP);
+
 #ifdef __cplusplus
 }
 #endif