diff --git a/borgbackup.spec b/borgbackup.spec
index 0ab2d98..dda8a4c 100644
--- a/borgbackup.spec
+++ b/borgbackup.spec
@@ -5,7 +5,7 @@
 
 Name:           %{pypi_name}
 Version:        %{pypi_version}
-Release:        1%{?dist}
+Release:        2%{?dist}
 Summary:        Deduplicated, encrypted, authenticated and compressed backups
 
 License:        BSD
@@ -15,6 +15,7 @@ Source0:        https://files.pythonhosted.org/packages/source/%(c=%{pypi_name};
 BuildRequires:  python%{python3_pkgversion}-devel
 BuildRequires:  python%{python3_version}dist(setuptools)
 BuildRequires:  python%{python3_version}dist(setuptools-scm) >= 1.7
+BuildRequires:  python%{python3_version}dist(cython)
 BuildRequires:  python%{python3_version}dist(pkgconfig)
 BuildRequires:  libacl-devel
 BuildRequires:  libzstd-devel
@@ -50,6 +51,13 @@ Documentation for borgbackup
 %autosetup -n %{pypi_name}-%{pypi_version}
 rm -rf %{pypi_name}.egg-info
 
+# Remove copies of bundled libraries to ensure these don't end up in our
+# binaries.
+rm -rf src/borg/algorithms/{lz4,xxh64,zstd}
+
+# Remove precompiled Cython code to ensure we always built "from source".
+find src/ -name '*.pyx' | sed -e 's/.pyx/.c/g' | xargs rm -f
+
 %build
 %py3_build
 
@@ -77,5 +85,9 @@ rm -rf html/.{doctrees,buildinfo}
 %endif
 
 %changelog
+* Wed Apr 20 2022 Daniel Uvehag <ufven+pkgs@protonmail.com> - 1.2.0-2
+- Removed bundled algorithms
+- Removed precompiled Cython files, and added Cython as a dependency
+
 * Tue Apr 19 2022 Daniel Uvehag <ufven+pkgs@protonmail.com> - 1.2.0-1
 - Initial package.