diff --git a/linux-game-manager.sh b/linux-game-manager.sh
index 1b9a846..3aadb40 100755
--- a/linux-game-manager.sh
+++ b/linux-game-manager.sh
@@ -531,7 +531,7 @@ case "${game}" in
                 cp /usr/share/games/doom/gzdoom.ini "${XDG_CONFIG_HOME:-$HOME/.config}/gzdoom/"
                 grep -qx 'Path=/usr/share/games/doom' "${XDG_CONFIG_HOME:-$HOME/.config}/gzdoom/gzdoom.ini" || \
                     sed -i 's;^\[IWADSearch.Directories\]$;[IWADSearch.Directories]\nPath=/usr/share/games/doom;' "${XDG_CONFIG_HOME:-$HOME/.config}/gzdoom/gzdoom.ini"
-                    sed 's/Mouse1=+attack/Control+=attack/' "${XDG_CONFIG_HOME:-$HOME/.config}/gzdoom/gzdoom.ini"
+                    sed -i 's/Mouse1=+attack/Control+=attack/' "${XDG_CONFIG_HOME:-$HOME/.config}/gzdoom/gzdoom.ini"
             else
                 dialog --backtitle "Linux Game Manager" \
                     --msgbox "Unable to extract files to /usr/share/games/doom. Please extract ${cache}/Toby Acc Mod V5-1 Update Fix.zip manually."