diff --git a/osmo-ggsn.changes b/osmo-ggsn.changes
index b2d14b5..7601116 100644
--- a/osmo-ggsn.changes
+++ b/osmo-ggsn.changes
@@ -5,6 +5,7 @@ Thu May 18 11:45:02 UTC 2023 - Jan Engelhardt <jengelh@inai.de>
   * Use rate_ctr for gsn_t available_counters
   * ggsn: Introduce tdef and make it configurable over VTY
   * gtp: Introduce VTY configurable GTP timer X3
+- Add ppc64.diff
 
 -------------------------------------------------------------------
 Wed Aug  3 18:29:09 UTC 2022 - Jan Engelhardt <jengelh@inai.de>
diff --git a/osmo-ggsn.spec b/osmo-ggsn.spec
index 68d836a..712b8a5 100644
--- a/osmo-ggsn.spec
+++ b/osmo-ggsn.spec
@@ -26,6 +26,7 @@ Group:          Productivity/Telephony/Servers
 URL:            https://osmocom.org/projects/openggsn/wiki/OsmoGGSN
 Source:         https://github.com/osmocom/osmo-ggsn/archive/%version.tar.gz
 Patch1:         build-fixes.diff
+Patch2:         ppc64.diff
 BuildRequires:  libtool >= 2
 BuildRequires:  pkgconfig >= 0.20
 BuildRequires:  systemd-rpm-macros
diff --git a/ppc64.diff b/ppc64.diff
new file mode 100644
index 0000000..6604f6d
--- /dev/null
+++ b/ppc64.diff
@@ -0,0 +1,17 @@
+From: Jan Engelhardt <jengelh@inai.de>
+Date: 2023-05-18 16:11:05.927027347 +0200
+Upstream: not submitted, too much work
+
+diff --git a/utils/gtp_echo_responder.c b/utils/gtp_echo_responder.c
+index 390fa25..3c383c2 100644
+--- a/utils/gtp_echo_responder.c
++++ b/utils/gtp_echo_responder.c
+@@ -80,7 +80,7 @@ struct gtp2_hdr {
+ #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+ 	uint32_t reserved2:8, seq:24;
+ #else
+-	uint8_t seq:24, reserved2:1;
++	uint32_t seq:24, reserved2:8;
+ #endif
+ } __attribute__((packed));
+