diff --git a/R-colorspace.spec b/R-colorspace.spec
index eca21dd..5604826 100644
--- a/R-colorspace.spec
+++ b/R-colorspace.spec
@@ -82,7 +82,7 @@ scientific paper: Zeileis et al. (2020, Journal of Statistical Software,
 
 %install
 mkdir -p %{buildroot}%{rlibdir}
-%{_bindir}/R CMD INSTALL -l %{buildroot}%{rlibdir} %{packname}
+%{_bindir}/R CMD INSTALL --built-timestamp="Thu, 01 Jan 1970 00:00:00 +0000" -l %{buildroot}%{rlibdir} %{packname}
 test -d %{packname}/src && (cd %{packname}/src; rm -f *.o *.so)
 rm -f %{buildroot}%{rlibdir}/R.css