diff --git a/xpp3.changes b/xpp3.changes
index ed43d6e..c55a35e 100644
--- a/xpp3.changes
+++ b/xpp3.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Sep 19 14:50:46 UTC 2024 - Fridrich Strba <fstrba@suse.com>
+
+- Use SOURCE_DATE_EPOCH for reproducible builds
+
 -------------------------------------------------------------------
 Tue Apr 30 11:54:40 UTC 2024 - Fridrich Strba <fstrba@suse.com>
 
diff --git a/xpp3.spec b/xpp3.spec
index 3d773a7..c87a32e 100644
--- a/xpp3.spec
+++ b/xpp3.spec
@@ -74,10 +74,14 @@ sed -i 's|depends="junit_main,junit_addons"|depends="junit_main"|' build.xml
 
 %build
 export CLASSPATH=$(build-classpath xml-commons-apis junit)
-ant xpp3 junit apidoc
+%{ant} xpp3 junit apidoc
 
 # Add OSGi metadata
-jar ufm build/%{name}-%{version}.jar %{SOURCE4}
+jar \
+%if %{?pkg_vcmp:%pkg_vcmp java-devel >= 17}%{!?pkg_vcmp:0}
+    --date="$(date -u -d @${SOURCE_DATE_EPOCH:-$(date +%%s)} +%%Y-%%m-%%dT%%H:%%M:%%SZ)" \
+%endif
+    --update --file=build/%{name}-%{version}.jar --manifest=%{SOURCE4}
 
 %install
 # jars