diff --git a/net-misc/ntp/files/ntp-4.2.8-sntp-test-pthreads.patch b/net-misc/ntp/files/ntp-4.2.8-sntp-test-pthreads.patch
new file mode 100644
index 0000000000000..4f8d15ff854ac
--- /dev/null
+++ b/net-misc/ntp/files/ntp-4.2.8-sntp-test-pthreads.patch
@@ -0,0 +1,13 @@
+https://bugs.gentoo.org/563922
+http://bugs.ntp.org/show_bug.cgi?id=2906
+
+--- a/sntp/tests/Makefile.in
++++ b/sntp/tests/Makefile.in
+@@ -783,6 +783,7 @@ base_LDADD = \
+ 	$(LIBOPTS_LDADD)			\
+ 	$(LDADD_LIBEVENT)			\
+ 	$(top_builddir)/../libntp/libntp.a	\
++	$(PTHREAD_LIBS) \
+ 	$(LDADD_LIBNTP)				\
+ 	$(LDADD_NTP)				\
+ 	$(NULL)
diff --git a/net-misc/ntp/ntp-4.2.8_p4.ebuild b/net-misc/ntp/ntp-4.2.8_p4.ebuild
index 69c2159d43b49..ae4fc76d8ec97 100644
--- a/net-misc/ntp/ntp-4.2.8_p4.ebuild
+++ b/net-misc/ntp/ntp-4.2.8_p4.ebuild
@@ -41,6 +41,7 @@ pkg_setup() {
 
 src_prepare() {
 	epatch "${FILESDIR}"/${PN}-4.2.8-ipc-caps.patch #533966
+	epatch "${FILESDIR}"/${PN}-4.2.8-sntp-test-pthreads.patch #563922
 	append-cppflags -D_GNU_SOURCE #264109
 	# Make sure every build uses the same install layout. #539092
 	find sntp/loc/ -type f '!' -name legacy -delete || die