diff --git a/test/run-ethercatmc-ioc.sh b/test/run-ethercatmc-ioc.sh
index 41566c24..9dc2877d 100755
--- a/test/run-ethercatmc-ioc.sh
+++ b/test/run-ethercatmc-ioc.sh
@@ -132,8 +132,8 @@ require essioc
 require calc
 require ethercatmc
 EOF
-  sed <../../test/startup/st.${MOTORCFG}.iocsh \
-    -e "s/^cd /#cd /" -e 's/^ *< *\([^ ]*\)/iocshLoad("$(ethercatmc_DIR)\1")/g' |
+  # shellcheck disable=SC2016
+  sed <../../test/startup/st.${MOTORCFG}.iocsh -e "s/^cd /#cd /" -e 's/^ *< *\([^ ]*\)/iocshLoad("$(ethercatmc_DIR)\1")/g' |
     grep -v '^  *#' >>$stcmddst || {
     echo >&2 can not create stcmddst $stcmddst
     exit 1