diff --git a/SOURCES/bind99-rh1647539.patch b/SOURCES/bind99-rh1647539.patch
new file mode 100644
index 0000000..5e02852
--- /dev/null
+++ b/SOURCES/bind99-rh1647539.patch
@@ -0,0 +1,28 @@
+From 89293e44e0d022463b03a92a30b3790d4569bd50 Mon Sep 17 00:00:00 2001
+From: Mark Andrews <marka@isc.org>
+Date: Thu, 20 Feb 2014 23:04:54 +1100
+Subject: [PATCH] 3752.   [bug]           Address potential REQUIRE failure if 
+                        DNS_STYLEFLAG_COMMENTDATA is set when printing out    
+                     a rdataset.
+
+(cherry picked from commit 86856f4f3069bb2d75851b56401ffde18f41198f)
+---
+ lib/dns/masterdump.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/lib/dns/masterdump.c b/lib/dns/masterdump.c
+index 80fcd4c12d..58dcd3de3e 100644
+--- a/lib/dns/masterdump.c
++++ b/lib/dns/masterdump.c
+@@ -451,7 +451,7 @@ rdataset_totext(dns_rdataset_t *rdataset,
+ 		 * Comment?
+ 		 */
+ 		if ((ctx->style.flags & DNS_STYLEFLAG_COMMENTDATA) != 0)
+-			isc_buffer_putstr(target, ";");
++			RETERR(str_totext(";", target));
+ 
+ 		/*
+ 		 * Owner name.
+-- 
+2.14.5
+
diff --git a/SPECS/bind.spec b/SPECS/bind.spec
index 124de49..48f91b1 100644
--- a/SPECS/bind.spec
+++ b/SPECS/bind.spec
@@ -26,7 +26,7 @@ Summary:  The Berkeley Internet Name Domain (BIND) DNS (Domain Name System) serv
 Name:     bind
 License:  ISC
 Version:  9.9.4
-Release:  72%{?PATCHVER}%{?PREVER}%{?dist}
+Release:  73%{?PATCHVER}%{?PREVER}%{?dist}
 Epoch:    32
 Url:      http://www.isc.org/products/BIND/
 Buildroot:%{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
@@ -173,6 +173,7 @@ Patch196: bind99-rh1549130.patch
 # commit cb735b3f902d4bb5f6e30328d5828d38efa63573
 Patch197: bind99-rh1549130-2.patch
 Patch198: bind99-CVE-2018-5740.patch
+Patch199: bind99-rh1647539.patch
 
 # Native PKCS#11 functionality from 9.10
 Patch150:bind-9.9-allow_external_dnskey.patch
@@ -498,6 +499,7 @@ tar -xf %{SOURCE48} -C bin/tests/system/geoip/data
 %patch196 -p1 -b .rh1549130
 %patch197 -p1 -b .rh1549130-2
 %patch198 -p1 -b .CVE-2018-5740
+%patch199 -p1 -b .rh1647539
 
 # Override upstream builtin keys
 cp -fp %{SOURCE29} bind.keys
@@ -1205,6 +1207,9 @@ rm -rf ${RPM_BUILD_ROOT}
 %endif
 
 %changelog
+* Fri Nov 23 2018 Petr Menšík <pemensik@redhat.com> - 32:9.9.4-73
+- Fixes debug level comments (#1647539)
+
 * Thu Sep 20 2018 Petr Menšík <pemensik@redhat.com> - 32:9.9.4-72
 - Fix automatic selinux boolean named_write_master_zones (#1569466)
 - Allow starting named with readonly home again