diff --git a/gnutls.changes b/gnutls.changes
index 6b6031a..e70e2b7 100644
--- a/gnutls.changes
+++ b/gnutls.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sat Apr 29 20:03:38 UTC 2017 - bwiedemann@suse.com
+
+- call gzip -n to make build fully reproducible
+
 -------------------------------------------------------------------
 Mon Feb 20 09:52:38 UTC 2017 - astieger@suse.com
 
diff --git a/gnutls.spec b/gnutls.spec
index 00072a8..e8325d0 100644
--- a/gnutls.spec
+++ b/gnutls.spec
@@ -246,7 +246,7 @@ cp doc/examples/*.{c,h} %{buildroot}%{_docdir}/libgnutls-devel/examples/
 
 # PNG files are replaced with the compressed files and that breaks
 # deduplication, this is workaround
-find %{buildroot}%{_datadir} -name '*.png' -exec gzip -9 {} +
+find %{buildroot}%{_datadir} -name '*.png' -exec gzip -n -9 {} +
 %fdupes -s %{buildroot}%{_datadir}
 
 %find_lang libgnutls --all-name