diff --git a/traefik1.7.changes b/traefik1.7.changes
index 7dc0a5b..219e5ff 100644
--- a/traefik1.7.changes
+++ b/traefik1.7.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Tue May 25 13:50:00 UTC 2021 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Allow to override build date with SOURCE_DATE_EPOCH
+  in order to make builds reproducible (boo#1047218)
+
 -------------------------------------------------------------------
 Thu Apr 29 14:22:24 UTC 2021 - alexandre.vicenzi@suse.com
 
diff --git a/traefik1.7.spec b/traefik1.7.spec
index 8c83f24..01644d6 100644
--- a/traefik1.7.spec
+++ b/traefik1.7.spec
@@ -16,7 +16,6 @@
 #
 
 %define project github.com/traefik/traefik
-%define build_date %(date +"%Y%m%d")
 
 Name:           traefik1.7
 Version:        1.7.30
@@ -51,6 +50,7 @@ Pointing Traefik at your orchestrator should be the only configuration step you
 %setup -q -n traefik-%{version}
 
 %build
+build_date=$(date -u -d @${SOURCE_DATE_EPOCH:-$(date +%%s)} +"%%Y%%m%%d")
 %{goprep} %{project}
 
 # tarball causes "inconsistent vendoring"
@@ -63,7 +63,7 @@ go generate
 go build \
   -buildmode=pie \
   -mod=vendor \
-  -ldflags "-s -w -X github.com/traefik/traefik/v2/pkg/version.Version=%{version} -X github.com/traefik/traefik/v2/pkg/version.Codename='' -X github.com/traefik/traefik/v2/pkg/version.BuildDate=%{build_date}" \
+  -ldflags "-s -w -X github.com/traefik/traefik/v2/pkg/version.Version=%{version} -X github.com/traefik/traefik/v2/pkg/version.Codename='' -X github.com/traefik/traefik/v2/pkg/version.BuildDate=${build_date}" \
   -o %{name} ./cmd/traefik/
 
 %install