diff --git a/Makefile b/Makefile
index ab52439..0431316 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ all:
 clean:
 	$(RM) -r ./build
 
-SOURCES = Makefile requirements.txt requirements-colab-plugins.txt *.tar.* *.whl *.zip
+SOURCES = Makefile requirements.txt requirements-colab-plugins.txt
 
 install:
 	mkdir -p $$(dirname $(TARGET))
@@ -29,10 +29,8 @@ sdist: $(TARBALL)
 $(TARBALL):
 	mkdir -p $$(dirname $(TARBALL))
 	$(RM) $(TARBALL)
-	mkdir -p $(DISTDIR)
-	ln $(SOURCES) $(DISTDIR)
+	cp $(SOURCES) $(DISTDIR)
 	tar caf $(TARBALL) $(DISTDIR)
-	$(RM) -r $(DISTDIR)
 
 distclean:
 	$(RM) -r $$(dirname $(TARBALL)) src/
--
libgit2 0.21.2