diff --git a/srcpkgs/firefox-esr/template b/srcpkgs/firefox-esr/template
index db24056b2dc..ea768c7f65d 100644
--- a/srcpkgs/firefox-esr/template
+++ b/srcpkgs/firefox-esr/template
@@ -1,7 +1,7 @@
 # Template build file for 'firefox-esr'.
 pkgname=firefox-esr
 version=38.6.1
-revision=1
+revision=2
 wrksrc="mozilla-esr${version%%.*}"
 short_desc="Lightweight gecko-based web browser"
 maintainer="Eivind Uggedal <eivind@uggedal.com>"
@@ -98,8 +98,11 @@ do_configure() {
 		--disable-profiling --disable-profilelocking
 }
 do_build() {
+	if [ "$SOURCE_DATE_EPOCH" ]; then
+		mozdate="MOZ_BUILD_DATE=$(date --date "@$SOURCE_DATE_EPOCH" "+%Y%m%d%H%M%S")"
+	fi
 	cd xbps-build
-	SHELL=/bin/bash make ${makejobs}
+	SHELL=/bin/bash make ${mozdate} ${makejobs}
 }
 do_install() {
 	cd xbps-build