diff --git a/flux/src/Dockerfile b/flux/src/Dockerfile
index ef1b6d13..0803ae0f 100644
--- a/flux/src/Dockerfile
+++ b/flux/src/Dockerfile
@@ -95,7 +95,7 @@ FROM ubuntu:20.04 as files2
     # test -z "$(echo $TARGETPLATFORM |grep arm)" || mv $hookd/webhookd-arm64 $hookd/webhookd; \
     # mv $hookd/webhookd* $hookd/webhookd; \
     test -z "$(echo $TARGETPLATFORM |grep arm)" || sed -i 's^cmd="go run ./"^cmd=./webhookd^g' $hookd/run.sh; \
-    sed "s^\$cmd^exec \$cmd^g" /rootfs/usr/local/webhookd/run.sh; \
+    sed -i "s^\$cmd^exec \$cmd^g" /rootfs/usr/local/webhookd/run.sh; \
     \
     # https://gitee.com/infrastlabs/fk-webhookd/releases/download/v22.08.18/v1.3.0.tar.gz #https://github.com/novnc/noVNC/archive
     # curl -k -O -fSL >> wget