diff --git a/tycho.changes b/tycho.changes
index d2cbe67..3ddaf7a 100644
--- a/tycho.changes
+++ b/tycho.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sat Sep  9 14:56:31 UTC 2023 - Fridrich Strba <fstrba@suse.com>
+
+- Reproducible builds: use SOURCE_DATE_EPOCH for timestamp
+
 -------------------------------------------------------------------
 Tue Sep  5 16:43:41 UTC 2023 - Fridrich Strba <fstrba@suse.com>
 
diff --git a/tycho.spec b/tycho.spec
index e0a18d1..c522a9a 100644
--- a/tycho.spec
+++ b/tycho.spec
@@ -349,11 +349,13 @@ sed -i '
 %if %{with bootstrap}
     -j \
 %endif
-    -- -Dtycho-version=%{version}-SNAPSHOT -DtychoBootstrapVersion=%{version}-SNAPSHOT \
-    -Dmaven.repo.local=$(pwd)/.m2 -Dfedora.p2.repos=$(pwd)/bootstrap \
+    -- \
 %if %{?pkg_vcmp:%pkg_vcmp java-devel >= 9}%{!?pkg_vcmp:0}
     -Dmaven.compiler.release=8 \
 %endif
+    -Dproject.build.outputTimestamp=$(date -u -d @${SOURCE_DATE_EPOCH:-$(date +%%s)} +%%Y-%%m-%%dT%%H:%%M:%%SZ) \
+    -Dtycho-version=%{version}-SNAPSHOT -DtychoBootstrapVersion=%{version}-SNAPSHOT \
+    -Dmaven.repo.local=$(pwd)/.m2 -Dfedora.p2.repos=$(pwd)/bootstrap \
     -Dsource=8
 
 %{mvn_artifact} fedoraproject-p2/org.fedoraproject.p2/pom.xml