diff --git a/iocBoot/iocCygwin/st.cmd b/iocBoot/iocCygwin/st.cmd
index 9c8d1dd58c26fdad21bd6f596d2fd4e6adfea039..ba9599f78ab231c8bd2ff069aa1ac7c5e1b82dca 100644
--- a/iocBoot/iocCygwin/st.cmd
+++ b/iocBoot/iocCygwin/st.cmd
@@ -15,7 +15,7 @@ errlogInit(20000)
 #epicsEnvSet EPICS_CA_MAX_ARRAY_BYTES 64008
 
 # set the protocol path for streamDevice
-epicsEnvSet STREAM_PROTOCOL_PATH ".:$(STREAM)/protocols"
+epicsEnvSet("STREAM_PROTOCOL_PATH", ".")
 
 ################################################################################
 # Tell EPICS all about the record types, device-support modules, drivers,