diff --git a/crda.spec b/crda.spec
index 9820730..e85bfd7 100644
--- a/crda.spec
+++ b/crda.spec
@@ -1,16 +1,13 @@
 Name:          crda
 Version:       4.14
-Release:       3mamba
+Release:       4mamba
 Summary:       The udev helper for communication between the kernel and userspace for regulatory compliance
 Group:         System/Kernel and Hardware
 Vendor:        openmamba
 Distribution:  openmamba
 Packager:      Silvan Calarco <silvan.calarco@mambasoft.it>
-URL:           http://drvbp1.linux-foundation.org/~mcgrof/rel-html/crda/
-#URL:           http://linuxwireless.org/en/developers/Regulatory/CRDA
+URL:           https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/crda.git/
 Source:        https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/crda.git/v%{version}/crda-%{version}.tar.bz2
-#Source:        http://kernel.org/pub/software/network/crda/crda-%{version}.tar.xz
-#Source:        http://linuxwireless.org/download/crda/crda-%{version}.tar.bz2
 Patch0:        %{name}-1.1.2-libnl-3.patch
 Patch1:        crda-4.14-python3.patch
 License:       ISC License
@@ -20,7 +17,6 @@ BuildRequires: libgcrypt-devel
 BuildRequires: libnl-devel
 ## AUTOBUILDREQ-END
 BuildRequires: python-M2Crypto-py3
-BuildRequires: python-typing-py3
 BuildRequires: python-pycryptodomex-py3
 BuildRequires: wireless-regdb
 Requires:      wireless-regdb
@@ -51,7 +47,7 @@ sed -i "s| python | %{__python3} |" Makefile
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
 make install \
    PREFIX=%{buildroot}%{_prefix} \
-   SBINDIR=%{buildroot}%{_sbindir} \
+   SBINDIR=%{buildroot}%{_sbindir}/ \
    LIBDIR=%{buildroot}%{_libdir} \
    INCLUDE_DIR=%{buildroot}%{_includedir}/reglib \
    MANDIR=%{buildroot}%{_mandir} \
@@ -79,6 +75,9 @@ sed -i "s|%{buildroot}||" %{buildroot}%{_udevrulesdir}/85-regulatory.rules
 %{_includedir}/reglib/*.h
 
 %changelog
+* Tue Oct 26 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 4.14-4mamba
+- fix for missing backslash after %_sbindir in udev rules file
+
 * Mon Mar 08 2021 Silvan Calarco <silvan.calarco@mambasoft.it> 4.14-3mamba
 - rebuilt under %_prefix