diff --git a/background_installer.sh b/background_installer.sh
index 86ee223..e2353fb 100755
--- a/background_installer.sh
+++ b/background_installer.sh
@@ -148,6 +148,7 @@ if [ "$1" == "win" ]; then
     pip install flask
     pip install flask-login
     pip install pyserial
+    pip install pymodbus
 
     echo ""
     echo "[MATIEC COMPILER]"