diff --git a/usr/lib/systemd/system/jupiter-fan-control.service b/usr/lib/systemd/system/jupiter-fan-control.service
index e3e9e34..cff45a7 100644
--- a/usr/lib/systemd/system/jupiter-fan-control.service
+++ b/usr/lib/systemd/system/jupiter-fan-control.service
@@ -4,8 +4,8 @@ Description=Jupiter fan control
 [Service]
 Type=simple
 
-ExecStart=/usr/share/jupiter-fan-control/fancontrol.py --run
-ExecStopPost=/usr/share/jupiter-fan-control/fancontrol.py --stop
+ExecStart=/usr/libexec/jupiter-fan-control/fancontrol.py --run
+ExecStopPost=/usr/libexec/jupiter-fan-control/fancontrol.py --stop
 
 # disable buffering so STDOUT and STDERR show up immediately in logs
 Environment=PYTHONUNBUFFERED=1
diff --git a/usr/share/jupiter-fan-control/PID.py b/usr/share/jupiter-fan-control/PID.py
index d52123e..c5786ff 100644
--- a/usr/share/jupiter-fan-control/PID.py
+++ b/usr/share/jupiter-fan-control/PID.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 #
 # This file is part of IvPID.
 # Copyright (C) 2015 Ivmech Mechatronics Ltd. <bilgi@ivmech.com>
@@ -64,7 +64,7 @@ class PID:
         """Calculates PID value for given reference feedback
 
         .. math::
-            u(t) = K_p e(t) + K_i \int_{0}^{t} e(t)dt + K_d {de}/{dt}
+            u(t) = K_p e(t) + K_i \\int_{0}^{t} e(t)dt + K_d {de}/{dt}
 
         .. figure:: images/pid_1.png
            :align:   center
diff --git a/usr/share/jupiter-fan-control/fancontrol.py b/usr/share/jupiter-fan-control/fancontrol.py
index 5829d5e..c797954 100755
--- a/usr/share/jupiter-fan-control/fancontrol.py
+++ b/usr/share/jupiter-fan-control/fancontrol.py
@@ -1,4 +1,4 @@
-#!/usr/bin/python -u
+#!/usr/bin/python3 -u
 """jupiter-fan-controller"""
 import signal
 import os