diff --git a/system-config-printer.spec b/system-config-printer.spec
index d2f3267..394a6ea 100644
--- a/system-config-printer.spec
+++ b/system-config-printer.spec
@@ -2,7 +2,7 @@
 
 Name:          system-config-printer
 Version:       1.5.11
-Release:       3mamba
+Release:       4mamba
 Summary:       Helper functions and classes for using CUPS
 Group:         System/Libraries/Python
 Vendor:        openmamba
@@ -51,7 +51,7 @@ The purpose of the tool is to configure a CUPS server (often the local machine)
 #%patch1 -p1
 #%patch2 -p1
 sed -i "s|!/usr/bin/python3|!%{__python36}|" \
-   *.py */*.py
+   *.py */*.py udev/udev-add-printer
 
 %build
 %configure \
@@ -95,6 +95,9 @@ sed -i "s|!/usr/bin/python3|!%{__python36}|" \
 %{_mandir}/man1/system-config-printer-applet.1*
 
 %changelog
+* Mon Aug 12 2019 Silvan Calarco <silvan.calarco@mambasoft.it> 1.5.11-4mamba
+- fix for python 3.6 also in udev-add-printer
+
 * Sun May 12 2019 Silvan Calarco <silvan.calarco@mambasoft.it> 1.5.11-3mamba
 - fix shebangs for python36