diff --git a/0001-gsm_23_003.h-add-GSM23003_IMEI_NUM_DIGITS_NO_CHK.patch b/0001-gsm_23_003.h-add-GSM23003_IMEI_NUM_DIGITS_NO_CHK.patch
new file mode 100644
index 0000000..ae622af
--- /dev/null
+++ b/0001-gsm_23_003.h-add-GSM23003_IMEI_NUM_DIGITS_NO_CHK.patch
@@ -0,0 +1,30 @@
+From 49fb992cd7bf94f25b93d9eeb711225daefa3a2d Mon Sep 17 00:00:00 2001
+From: Oliver Smith <osmith@sysmocom.de>
+Date: Mon, 21 Jan 2019 16:32:46 +0100
+Subject: [PATCH] gsm_23_003.h: add GSM23003_IMEI_NUM_DIGITS_NO_CHK
+
+Add new define for the 14 digit IMEI without the Luhn checksum, as it
+is used in OsmoHLR.
+
+Change-Id: I02b54cf01a674a1911c5c897fbec02240f88b521
+---
+ include/osmocom/gsm/protocol/gsm_23_003.h | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/include/osmocom/gsm/protocol/gsm_23_003.h b/include/osmocom/gsm/protocol/gsm_23_003.h
+index ee697ff4..babd0f4b 100644
+--- a/include/osmocom/gsm/protocol/gsm_23_003.h
++++ b/include/osmocom/gsm/protocol/gsm_23_003.h
+@@ -24,6 +24,9 @@
+ 					 GSM23003_IMEI_SNR_NUM_DIGITS + 1)
+ #define GSM23003_IMEISV_NUM_DIGITS	(GSM23003_IMEI_TAC_NUM_DIGITS + \
+ 					 GSM23003_IMEI_SNR_NUM_DIGITS + 2)
++/* IMEI without Luhn checksum */
++#define GSM23003_IMEI_NUM_DIGITS_NO_CHK	(GSM23003_IMEI_TAC_NUM_DIGITS + \
++					 GSM23003_IMEI_SNR_NUM_DIGITS)
+ 
+ /* Chapter 19.2 "epc.mnc000.mcc000.3gppnetwork.org" */
+ #define GSM23003_HOME_NETWORK_DOMAIN_LEN	33
+-- 
+2.16.4
+
diff --git a/libosmocore.changes b/libosmocore.changes
index 6b97c35..3ffd271 100644
--- a/libosmocore.changes
+++ b/libosmocore.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Tue Feb 19 14:54:30 UTC 2019 - Martin Hauke <mardnh@gmx.de>
+
+- Add patch:
+  * 0001-gsm_23_003.h-add-GSM23003_IMEI_NUM_DIGITS_NO_CHK.patch
+    Needed for osmo-hlr 1.0.0
+
 -------------------------------------------------------------------
 Thu Jan 31 14:47:59 UTC 2019 - mardnh@gmx.de
 
diff --git a/libosmocore.spec b/libosmocore.spec
index 29d2b7c..23184ff 100644
--- a/libosmocore.spec
+++ b/libosmocore.spec
@@ -12,7 +12,7 @@
 # license that conforms to the Open Source Definition (Version 1.9)
 # published by the Open Source Initiative.
 
-# Please submit bugfixes or comments via http://bugs.opensuse.org/
+# Please submit bugfixes or comments via https://bugs.opensuse.org/
 #
 
 
@@ -24,6 +24,7 @@ License:        GPL-2.0-only AND GPL-2.0-or-later AND LGPL-2.1-or-later AND AGPL
 Group:          Productivity/Telephony/Utilities
 Url:            https://osmocom.org/projects/libosmocore/wiki/Libosmocore
 Source:         %name-%version.tar.xz
+Patch0:         0001-gsm_23_003.h-add-GSM23003_IMEI_NUM_DIGITS_NO_CHK.patch
 BuildRequires:  automake >= 1.6
 BuildRequires:  libtool >= 2
 BuildRequires:  pkg-config >= 0.20
@@ -272,6 +273,7 @@ applications that want to make use of libosmovty.
 
 %prep
 %setup -q
+%patch0 -p1
 
 %build
 echo "%version" >.tarball-version