diff --git a/bind-9.11-oot-gen.patch b/bind-9.11-oot-gen.patch
new file mode 100644
index 0000000..9a7f991
--- /dev/null
+++ b/bind-9.11-oot-gen.patch
@@ -0,0 +1,47 @@
+From cb654ddde5953cab9dfde7173ea1ed14b51c3727 Mon Sep 17 00:00:00 2001
+From: Mark Andrews <marka@isc.org>
+Date: Sun, 22 Dec 2019 21:51:21 +0000
+Subject: [PATCH] Merge branch
+ '1530-lib-dns-gen-c-29-26-fatal-error-isc-platform-h-no-such-file-or-directory-v9_11'
+ into 'v9_11'
+
+Resolve "lib/dns/gen.c:29:26: fatal error: isc/platform.h: No such file or directory"
+
+See merge request isc-projects/bind9!2794
+
+(cherry picked from commit 335ab375d6a0227fb362722acad22f2a5b75d8b7)
+---
+ lib/dns/gen.c | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/lib/dns/gen.c b/lib/dns/gen.c
+index 81bc7ada1d..5fbdc3bfd3 100644
+--- a/lib/dns/gen.c
++++ b/lib/dns/gen.c
+@@ -26,18 +26,18 @@
+ 
+ #include <sys/types.h>
+ 
+-#include <isc/platform.h>
+-
+ #include <ctype.h>
++#include <errno.h>
+ #include <limits.h>
+ #include <stdint.h>
+-#include <stdlib.h>
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <string.h>
+ #include <time.h>
+-#include <errno.h>
+-#include <limits.h>
++
++#ifndef PATH_MAX
++#define PATH_MAX 1024
++#endif
+ 
+ #ifdef WIN32
+ #include "gen-win32.h"
+-- 
+2.21.0
+
diff --git a/bind.spec b/bind.spec
index 23cf476..1816d6a 100644
--- a/bind.spec
+++ b/bind.spec
@@ -168,6 +168,7 @@ Patch183: bind-9.11-rh1736762-5.patch
 Patch184: bind-9.11-rh1736762-6.patch
 Patch185: bind-9.11-rh1736762-7.patch
 Patch186: bind-9.11-rh1736762-8.patch
+Patch187: bind-9.11-oot-gen.patch
 
 # SDB patches
 Patch11: bind-9.3.2b2-sdbsrc.patch
@@ -577,6 +578,7 @@ are used for building ISC DHCP.
 %patch184 -p1 -b .rh1736762-6
 %patch185 -p1 -b .rh1736762-7
 %patch186 -p1 -b .rh1736762-8
+%patch187 -p1 -b .oot-gen
 
 mkdir lib/dns/tests/testdata/dstrandom
 cp -a %{SOURCE50} lib/dns/tests/testdata/dstrandom/random.data