diff --git a/src/freedombone-utils-web b/src/freedombone-utils-web
index 1305def8..d78bcd91 100755
--- a/src/freedombone-utils-web
+++ b/src/freedombone-utils-web
@@ -491,7 +491,7 @@ function install_dynamicdns {
 
     if [ -f /usr/local/sbin/inadyn ]; then
         if grep -q "inadyn commit" "$COMPLETION_FILE"; then
-            sed -d '/inadyn commit/d' "$COMPLETION_FILE"
+            sed -i '/inadyn commit/d' "$COMPLETION_FILE"
         fi
     fi