diff --git a/iwl3945-firmware.spec b/iwl3945-firmware.spec
index d1cd18d..0ebc957 100644
--- a/iwl3945-firmware.spec
+++ b/iwl3945-firmware.spec
@@ -16,6 +16,7 @@ ExcludeArch: ppc ppc64
 Provides: iwlwifi-firmware = %{version}-%{release}
 Obsoletes: iwlwifi-firmware =< 2.14.4-1
 Obsoletes: iwlwifi-3945-firmware =< 2.14.4-1
+Conflicts: filesystem < 3
 
 %description
 This package contains the firmware required by the iwl3945 driver for Linux.
@@ -41,9 +42,9 @@ chmod 0644 LICENSE README
 
 %install
 %{__rm} -rf %{buildroot}
-%{__mkdir_p} %{buildroot}/lib/firmware
+%{__mkdir_p} %{buildroot}%{_prefix}/lib/firmware
 %{__install} -p -m 0644 iwlwifi-3945*.ucode */iwlwifi-3945*.ucode \
-    %{buildroot}/lib/firmware/
+    %{buildroot}%{_prefix}/lib/firmware/
 
 
 %clean
@@ -53,7 +54,7 @@ chmod 0644 LICENSE README
 %files
 %defattr(-,root,root,-)
 %doc LICENSE README
-/lib/firmware/*.ucode
+%{_prefix}/lib/firmware/*.ucode
 
 
 %changelog