diff --git a/tools/stm32w/stm32w_flasher/py_files/stm32w_flasher.py b/tools/stm32w/stm32w_flasher/py_files/stm32w_flasher.py
index 4f486408a..d83c095e7 100755
--- a/tools/stm32w/stm32w_flasher/py_files/stm32w_flasher.py
+++ b/tools/stm32w/stm32w_flasher/py_files/stm32w_flasher.py
@@ -12,10 +12,11 @@ import optparse, os, sys, time
 try:
     import serial
     import ftdi
+    import pyudev
 except:
     print 'Python modules serial and ftdi could not be loaded.'
     print 'Please install these dependencies:'
-    print '(On Ubuntu) $ sudo apt-get install python-serial python-ftdi'
+    print '(On Ubuntu) $ sudo apt-get install python-serial python-ftdi python-pyudev'
     sys.exit(-1)
 
 from messages import infoMessage, errorMessage