diff --git a/i2c-tools.spec b/i2c-tools.spec
index fe77e1a..303fef0 100644
--- a/i2c-tools.spec
+++ b/i2c-tools.spec
@@ -1,6 +1,6 @@
 Name:          i2c-tools
 Version:       4.0
-Release:       1mamba
+Release:       2mamba
 Summary:       A heterogeneous set of I2C tools for Linux
 Group:         System/Kernel and Hardware
 Vendor:        openmamba
@@ -39,11 +39,11 @@ This package contains development files for %{name}.
 %setup -q
 
 %build
-%make prefix=%{_prefix}
+%make prefix=%{_prefix} libdir=%{_libdir}
 
 %install
 [ "%{buildroot}" != / ] && rm -rf "%{buildroot}"
-%makeinstall prefix=%{_prefix}
+%makeinstall prefix=%{_prefix} libdir=%{_libdir}
 
 rm -f %{buildroot}%{_includedir}/linux/i2c-dev.h
 
@@ -72,16 +72,20 @@ rm -f %{buildroot}%{_includedir}/linux/i2c-dev.h
 
 %files -n libi2c
 %defattr(-,root,root)
-%{_prefix}/lib/libi2c.so.*
+%{_libdir}/libi2c.so.*
 %doc COPYING
 
 %files -n libi2c-devel
 %defattr(-,root,root)
+%dir %{_includedir}/i2c
 %{_includedir}/i2c/smbus.h
-%{_prefix}/lib/libi2c.a
-%{_prefix}/lib/libi2c.so
+%{_libdir}/libi2c.a
+%{_libdir}/libi2c.so
 
 %changelog
+* Thu Sep 13 2018 Silvan Calarco <silvan.calarco@mambasoft.it> 4.0-2mamba
+- x86_64: fix library path
+
 * Sun Jul 29 2018 Silvan Calarco <silvan.calarco@mambasoft.it> 4.0-1mamba
 - update to 4.0