diff --git a/0506-dyndns_tests-Fix-unit-test-with-missing-features-in-.patch b/0506-dyndns_tests-Fix-unit-test-with-missing-features-in-.patch
new file mode 100644
index 0000000..c5805a8
--- /dev/null
+++ b/0506-dyndns_tests-Fix-unit-test-with-missing-features-in-.patch
@@ -0,0 +1,43 @@
+From 8bf5237eea4f1afea3656a3385aa4fcdc2f28ffd Mon Sep 17 00:00:00 2001
+From: Lukas Slebodnik <lslebodn@fedoraproject.org>
+Date: Mon, 22 Jan 2018 17:23:32 +0100
+Subject: [PATCH] dyndns_tests: Fix unit test with missing features in nsupdate
+
+We return different string in the function nsupdate_msg_add_realm_cmd
+if realm command is not supported by nsupdate.
+However cmocka based unit test did not expect such string and failed.
+---
+ src/tests/cmocka/test_dyndns.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/src/tests/cmocka/test_dyndns.c b/src/tests/cmocka/test_dyndns.c
+index fafd4d8a595cc608447d4068eeb0cee2ba819d89..a105dd6e6093c63686ed30384b42d6a942d1ee9f 100644
+--- a/src/tests/cmocka/test_dyndns.c
++++ b/src/tests/cmocka/test_dyndns.c
+@@ -406,7 +406,11 @@ void dyndns_test_create_fwd_msg(void **state)
+ 
+     assert_string_equal(msg,
+                         "server Winterfell\n"
++#ifdef HAVE_NSUPDATE_REALM
+                         "realm North\n"
++#else
++                        "\n"
++#endif
+                         "update delete bran_stark. in A\n"
+                         "update add bran_stark. 1234 in A 192.168.0.2\n"
+                         "send\n"
+@@ -423,7 +427,11 @@ void dyndns_test_create_fwd_msg(void **state)
+     assert_int_equal(ret, EOK);
+ 
+     assert_string_equal(msg,
++#ifdef HAVE_NSUPDATE_REALM
+                         "realm North\n"
++#else
++                        "\n"
++#endif
+                         "update delete bran_stark. in A\n"
+                         "update add bran_stark. 1234 in A 192.168.0.2\n"
+                         "send\n"
+-- 
+2.15.1
+
diff --git a/sssd.spec b/sssd.spec
index 958b62f..1445b2f 100644
--- a/sssd.spec
+++ b/sssd.spec
@@ -123,6 +123,7 @@ Patch0502: 0502-SYSTEMD-Use-capabilities.patch
 Patch0503: 0503-Disable-stopping-idle-socket-activated-responders.patch
 Patch0504: 0504-KCM-temporary-increase-hardcoded-buffers.patch
 Patch0505: 0505-libnfsidmap-Use-public-plugin-header-file-if-availab.patch
+Patch0506: 0506-dyndns_tests-Fix-unit-test-with-missing-features-in-.patch
 
 ### Dependencies ###