diff --git a/build-package.sh b/build-package.sh
index b80bed0932..0f95597d1a 100755
--- a/build-package.sh
+++ b/build-package.sh
@@ -3,6 +3,9 @@
 
 set -e -o pipefail -u
 
+SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct)
+export SOURCE_DATE_EPOCH
+
 : "${TMPDIR:=/tmp}"
 export TMPDIR