diff --git a/pkgs/package-rpm.nix b/pkgs/package-rpm.nix
index 4a4b5a19..ee840fb1 100644
--- a/pkgs/package-rpm.nix
+++ b/pkgs/package-rpm.nix
@@ -61,10 +61,15 @@ runCommand "rosenpass-${version}.rpm" { } ''
   mkdir -p /build/tmp
   ls -R rpmbuild
 
+  # rpmbuild requires these defines, because Nix would otherwise overwrite them, especially %{_bindir}
   ${rpm}/bin/rpmbuild \
     -bb \
     --dbpath=$HOME \
     --define "_tmppath /build/tmp" \
+    --define "_prefix /usr" \
+    --define "_exec_prefix %{_prefix}" \
+    --define "_bindir %{_exec_prefix}/bin" \
+    --define "_sysconfdir /etc" \
     rpmbuild/SPECS/rosenpass.spec
 
   cp rpmbuild/RPMS/${arch}/rosenpass*.rpm $out