diff --git a/App/startup/startup.script_linux b/App/startup/startup.script_linux
index 7e8b408..e715f98 100644
--- a/App/startup/startup.script_linux
+++ b/App/startup/startup.script_linux
@@ -32,6 +32,8 @@ epicsEnvSet TEMPLATES, $(INSTBASE)/iocBoot/templates
 epicsEnvSet CFG, $(PWD)/cfg
 epicsEnvSet STREAM_PROTOCOL_PATH, .:$(PWD)/cfg
 
-require sysmon,$(sysmon_VERSION=ifexists)
+epicsEnvSet LIBRARY_DEFAULT_VERSION_R3.14.8 ""
+epicsEnvSet LIBRARY_DEFAULT_VERSION "$(LIBRARY_DEFAULT_VERSION_$(EPICS)=ifexists)"
+require sysmon $(sysmon_VERSION=$(LIBRARY_DEFAULT_VERSION))
 
 ! iocBootNotify.sh $(IOC) - \"\${SHELLBOX#*:}\" - $(_) $(PWD)/startup.script - $(EPICS) -