diff --git a/jnr-constants.changes b/jnr-constants.changes
index 78f388b..fb3693e 100644
--- a/jnr-constants.changes
+++ b/jnr-constants.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sat Sep  9 14:30:09 UTC 2023 - Fridrich Strba <fstrba@suse.com>
+
+- Reproducible builds: use SOURCE_DATE_EPOCH for timestamp
+
 -------------------------------------------------------------------
 Sun Dec 18 06:51:14 UTC 2022 - Anton Shvetz <shvetz.anton@gmail.com>
 
diff --git a/jnr-constants.spec b/jnr-constants.spec
index b1f8fba..b504c35 100644
--- a/jnr-constants.spec
+++ b/jnr-constants.spec
@@ -52,7 +52,8 @@ This package contains the API documentation for %{name}.
 %pom_remove_plugin :maven-javadoc-plugin
 
 %build
-%{mvn_build} -f
+%{mvn_build} -f -- \
+    -Dproject.build.outputTimestamp=$(date -u -d @${SOURCE_DATE_EPOCH:-$(date +%%s)} +%%Y-%%m-%%dT%%H:%%M:%%SZ)
 
 %install
 %mvn_install