diff --git a/jcsp.changes b/jcsp.changes
index f9eb5da..6f3a397 100644
--- a/jcsp.changes
+++ b/jcsp.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sat Sep  9 14:20:14 UTC 2023 - Fridrich Strba <fstrba@suse.com>
+
+- Reproducible builds: use SOURCE_DATE_EPOCH for timestamp
+
 -------------------------------------------------------------------
 Tue Mar 22 12:35:34 UTC 2022 - Fridrich Strba <fstrba@suse.com>
 
diff --git a/jcsp.spec b/jcsp.spec
index de85032..806b822 100644
--- a/jcsp.spec
+++ b/jcsp.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package jcsp
 #
-# Copyright (c) 2022 SUSE LLC
+# Copyright (c) 2023 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -122,8 +122,9 @@ rm -r src/org/jcsp/win32 \
 %build
 
 %{mvn_build} -f -- \
+    -Dproject.build.outputTimestamp=$(date -u -d @${SOURCE_DATE_EPOCH:-$(date +%%s)} +%%Y-%%m-%%dT%%H:%%M:%%SZ) \
 %if %{?pkg_vcmp:%pkg_vcmp java-devel >= 9}%{!?pkg_vcmp:0}
-	-Dmaven.compiler.release=8 \
+    -Dmaven.compiler.release=8 \
 %endif
     -Dsource=8 -Dproject.build.sourceEncoding=UTF-8