diff --git a/unbound-initgroups-r1453.patch b/unbound-initgroups-r1453.patch
new file mode 100644
index 0000000..061c1f8
--- /dev/null
+++ b/unbound-initgroups-r1453.patch
@@ -0,0 +1,105 @@
+commit b1a2731277dd0939572901bf018afa7a0debdb54
+Author: wouter <wouter@be551aaa-1e26-0410-a405-d3ace91eadb9>
+Date:   Thu Feb 5 11:12:01 2009 +0000
+
+    call initgroups.
+    
+    
+    git-svn-id: http://unbound.nlnetlabs.nl/svn/trunk@1453 be551aaa-1e26-0410-a405-d3ace91eadb9
+
+diff --git a/config.h.in b/config.h.in
+index 956224d..aa7ce2d 100644
+--- a/config.h.in
++++ b/config.h.in
+@@ -85,6 +85,9 @@
+ /* Define to 1 if you have the `gmtime_r' function. */
+ #undef HAVE_GMTIME_R
+ 
++/* Define to 1 if you have the <grp.h> header file. */
++#undef HAVE_GRP_H
++
+ /* If you have HMAC_CTX_init */
+ #undef HAVE_HMAC_CTX_INIT
+ 
+@@ -97,6 +100,9 @@
+ /* Define to 1 if you have the `inet_pton' function. */
+ #undef HAVE_INET_PTON
+ 
++/* Define to 1 if you have the `initgroups' function. */
++#undef HAVE_INITGROUPS
++
+ /* Define to 1 if you have the <inttypes.h> header file. */
+ #undef HAVE_INTTYPES_H
+ 
+diff --git a/configure b/configure
+index a823b0b..0b1f96a 100755
+--- a/configure
++++ b/configure
+@@ -19961,7 +19961,8 @@ fi
+ 
+ 
+ 
+-for ac_header in stdarg.h stdbool.h netinet/in.h sys/param.h sys/socket.h sys/uio.h sys/resource.h arpa/inet.h syslog.h netdb.h sys/wait.h pwd.h glob.h
++
++for ac_header in stdarg.h stdbool.h netinet/in.h sys/param.h sys/socket.h sys/uio.h sys/resource.h arpa/inet.h syslog.h netdb.h sys/wait.h pwd.h glob.h grp.h
+ do
+ as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh`
+ { echo "$as_me:$LINENO: checking for $ac_header" >&5
+@@ -25282,7 +25283,8 @@ fi
+ 
+ 
+ 
+-for ac_func in tzset sigprocmask fcntl getpwnam getrlimit setsid sbrk chroot kill sleep usleep random srandom recvmsg sendmsg writev setresuid setreuid setresgid setregid glob
++
++for ac_func in tzset sigprocmask fcntl getpwnam getrlimit setsid sbrk chroot kill sleep usleep random srandom recvmsg sendmsg writev setresuid setreuid setresgid setregid glob initgroups
+ do
+ as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
+ { echo "$as_me:$LINENO: checking for $ac_func" >&5
+diff --git a/configure.ac b/configure.ac
+index bd000bc..48a4385 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -480,7 +480,7 @@ AC_PROG_LIBTOOL
+ 
+ # Checks for header files.
+ AC_HEADER_STDC
+-AC_CHECK_HEADERS([stdarg.h stdbool.h netinet/in.h sys/param.h sys/socket.h sys/uio.h sys/resource.h arpa/inet.h syslog.h netdb.h sys/wait.h pwd.h glob.h],,, [AC_INCLUDES_DEFAULT])
++AC_CHECK_HEADERS([stdarg.h stdbool.h netinet/in.h sys/param.h sys/socket.h sys/uio.h sys/resource.h arpa/inet.h syslog.h netdb.h sys/wait.h pwd.h glob.h grp.h],,, [AC_INCLUDES_DEFAULT])
+ 
+ # check for types
+ AC_CHECK_TYPE(int8_t, char)
+@@ -854,7 +854,7 @@ AC_CHECK_GETADDRINFO_WITH_INCLUDES
+ if test $ac_cv_func_getaddrinfo = no; then
+ AC_LIBOBJ([fake-rfc2553])
+ fi
+-AC_CHECK_FUNCS([tzset sigprocmask fcntl getpwnam getrlimit setsid sbrk chroot kill sleep usleep random srandom recvmsg sendmsg writev setresuid setreuid setresgid setregid glob])
++AC_CHECK_FUNCS([tzset sigprocmask fcntl getpwnam getrlimit setsid sbrk chroot kill sleep usleep random srandom recvmsg sendmsg writev setresuid setreuid setresgid setregid glob initgroups])
+ 
+ # check if setreuid en setregid fail, on MacOSX10.4(darwin8).
+ if echo $build_os | grep darwin8 > /dev/null; then
+diff --git a/daemon/unbound.c b/daemon/unbound.c
+index 09767a4..6c5fb6f 100644
+--- a/daemon/unbound.c
++++ b/daemon/unbound.c
+@@ -56,6 +56,9 @@
+ #ifdef HAVE_PWD_H
+ #include <pwd.h>
+ #endif
++#ifdef HAVE_GRP_H
++#include <grp.h>
++#endif
+ 
+ #ifdef HAVE_SYS_RESOURCE_H
+ #include <sys/resource.h>
+@@ -451,6 +454,11 @@ perform_setup(struct daemon* daemon, struct config_file* cfg, int debug_mode,
+ 	/* drop permissions after chroot, getpwnam, pidfile, syslog done*/
+ #ifdef HAVE_GETPWNAM
+ 	if(cfg->username && cfg->username[0]) {
++#ifdef HAVE_INITGROUPS
++		if(initgroups(cfg->username, gid) != 0)
++			log_warn("unable to initgroups %s: %s",
++				cfg->username, strerror(errno));
++#endif
+ #ifdef HAVE_SETRESGID
+ 		if(setresgid(gid,gid,gid) != 0)
+ #elif defined(HAVE_SETREGID) && !defined(DARWIN_BROKEN_SETREUID)
diff --git a/unbound.spec b/unbound.spec
index 13630f6..c0e9c55 100644
--- a/unbound.spec
+++ b/unbound.spec
@@ -9,6 +9,7 @@ Source1: unbound.init
 Source2: unbound.conf
 Source3: unbound.munin
 Patch0: unbound-iterator.patch
+Patch1: unbound-initgroups-r1453.patch
 Group: System Environment/Daemons
 BuildRoot: %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 BuildRequires: flex, openssl-devel >= 0.9.8g-12, ldns-devel >= 1.5.0, 
@@ -64,6 +65,7 @@ Contains libraries used by the unbound server and client applications
 %prep
 %setup -q 
 %patch0 
+%patch1 -p1
 
 %build
 %configure  --with-ldns= --with-libevent --with-pthreads --with-ssl \