diff --git a/testing/install_script.sh b/testing/install_script.sh
index c58b399..a7fc57b 100644
--- a/testing/install_script.sh
+++ b/testing/install_script.sh
@@ -86,7 +86,7 @@ else
 fi
 
 sleep 1
-sed -i 's/server-port=25565/server-port=$GAME_PORT_TCP/g' /MCserver/server.properties
+sed -i 's/server-port=25565/server-port='${GAME_PORT_TCP}'/g' /MCserver/server.properties
 sleep 60
 
 # Set permissions.