diff --git a/osmo-iuh.changes b/osmo-iuh.changes
index 4087bcd..c83efe6 100644
--- a/osmo-iuh.changes
+++ b/osmo-iuh.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Mon Jan  7 12:46:22 UTC 2019 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Add reproducible.patch to make package build reproducible
+  (boo#1047218)
+
 -------------------------------------------------------------------
 Tue Dec 11 13:21:58 UTC 2018 - Jan Engelhardt <jengelh@inai.de>
 
diff --git a/osmo-iuh.spec b/osmo-iuh.spec
index 8105f78..e934b97 100644
--- a/osmo-iuh.spec
+++ b/osmo-iuh.spec
@@ -27,6 +27,7 @@ Url:            https://osmocom.org/projects/osmohnbgw/wiki
 Source:         %name-%version.tar.xz
 Patch1:         0001-fix-return-values.patch
 Patch3:         0001-iu_client-uses-gprs_msgb.h.patch
+Patch4:         reproducible.patch
 BuildRequires:  automake >= 1.9
 BuildRequires:  libtool >= 2
 BuildRequires:  lksctp-tools-devel
diff --git a/reproducible.patch b/reproducible.patch
new file mode 100644
index 0000000..803c770
--- /dev/null
+++ b/reproducible.patch
@@ -0,0 +1,42 @@
+https://gerrit.osmocom.org/#/c/osmo-iuh/+/9387
+commit 7a97fcafedead40b311eef65467480bd72fdd18b
+Author: Bernhard M. Wiedemann <bwiedemann@suse.de>
+Date:   Wed May 30 13:20:29 2018 +0200
+
+    asn1tostruct: allow to override build date
+    
+    in order to make builds reproducible.
+    See https://reproducible-builds.org/ for why this is good
+    and https://reproducible-builds.org/specs/source-date-epoch/
+    for the definition of this variable.
+    
+    Also do not record build user name to not have it vary.
+    
+    Change-Id: I5cfa465cc82f009f28dd7f12ced0e72a05fda842
+
+diff --git a/asn1/utils/asn1tostruct.py b/asn1/utils/asn1tostruct.py
+index 0bba9dd..3c33980 100755
+--- a/asn1/utils/asn1tostruct.py
++++ b/asn1/utils/asn1tostruct.py
+@@ -4,6 +4,7 @@ import re, os, sys, string
+ import datetime
+ import getopt
+ import getpass
++import time
+ 
+ version = "0.5osmo1"
+ 
+@@ -33,11 +34,11 @@ def printDebug(string):
+         print string
+ 
+ def outputHeaderToFile(f, filename):
+-    now = datetime.datetime.now()
++    now = datetime.datetime.utcfromtimestamp(int(os.environ.get('SOURCE_DATE_EPOCH', time.time())))
+     f.write("/*******************************************************************************\n")
+     f.write(" * This file had been created by asn1tostruct.py script v%s\n" % (version))
+     f.write(" * Please do not modify this file but regenerate it via script.\n")
+-    f.write(" * Created on: %s by %s\n * from %s\n" % (str(now), getpass.getuser(), filenames))
++    f.write(" * Created on: %s\n * from %s\n" % (str(now), filenames))
+     f.write(" ******************************************************************************/\n")
+ 
+ def lowerFirstCamelWord(word):