diff --git a/src/rsrv/caservertask.c b/src/rsrv/caservertask.c
index 897a117c0..64cc8eb2d 100644
--- a/src/rsrv/caservertask.c
+++ b/src/rsrv/caservertask.c
@@ -37,6 +37,8 @@
 #include "dbEvent.h"
 #include "dbCommon.h"
 #include "epicsStdioRedirect.h"
+#include "epicsExit.h"
+#include "epicsString.h"
 
 #define epicsExportSharedSymbols
 #include "rsrv.h"
@@ -112,7 +114,7 @@ static void req_server (void *pParm)
 		if ( SOCKERRNO == SOCK_EADDRINUSE ) {
 #ifndef vxWorks
             const char* multiple_iocs = getenv("EPICS_ALLOW_MULTIPLE_IOCS");
-            if (multiple_iocs && strcasecmp(multiple_iocs, "NO") == 0)
+            if (multiple_iocs && epicsStrCaseCmp(multiple_iocs, "NO") == 0)
             {
                 errlogPrintf ( "CAS: Default server port %d unavailable.\n" ,ca_server_port);
                 errlogPrintf ( "CAS: Probably already running an IOC on this computer.\n");