diff --git a/topspeedserver.sh b/topspeedserver.sh
index dd4753e..e201b03 100755
--- a/topspeedserver.sh
+++ b/topspeedserver.sh
@@ -13,5 +13,5 @@ if ! [[ "${server}" =~ ^[0-9.]*$ ]]; then
 fi
 ip="${ip:-${server}}"
 
-sed "s/^Multiplayer=.*/Multiplayer=${ip}/" "${path}/TopSpeed.cfg"
+sed -i "s/^Multiplayer=.*/Multiplayer=${ip}/" "${path}/TopSpeed.cfg"
 exit 0