diff --git a/.gitignore b/.gitignore
index 0834a00..6e7ff0d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,6 +42,7 @@ compat/imsg-buffer.c
 compat/imsg.c
 compat/md5.c
 compat/reallocarray.c
+compat/recallocarray.c
 compat/sha2.c
 compat/strlcat.c
 compat/strlcpy.c
diff --git a/compat/Makefile.am b/compat/Makefile.am
index 40ea83d..ec251bb 100644
--- a/compat/Makefile.am
+++ b/compat/Makefile.am
@@ -69,6 +69,10 @@ if !HAVE_CLOSEFROM
 libcompat_la_SOURCES += closefrom.c
 endif
 
+if !HAVE_FREEZERO
+libcompat_la_SOURCES += freezero.c
+endif
+
 if !HAVE_IMSG
 libcompat_la_SOURCES += imsg.c
 libcompat_la_SOURCES += imsg-buffer.c
@@ -82,6 +86,10 @@ if !HAVE_REALLOCARRAY
 libcompat_la_SOURCES += reallocarray.c
 endif
 
+if !HAVE_RECALLOCARRAY
+libcompat_la_SOURCES += recallocarray.c
+endif
+
 if !HAVE_SETPROCTITLE
 libcompat_la_SOURCES += setproctitle.c
 endif
diff --git a/compat/freezero.c b/compat/freezero.c
new file mode 100644
index 0000000..31face3
--- /dev/null
+++ b/compat/freezero.c
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2008, 2010, 2011, 2016 Otto Moerbeek <otto@drijf.net>
+ * Copyright (c) 2012 Matthew Dempsky <matthew@openbsd.org>
+ * Copyright (c) 2008 Damien Miller <djm@openbsd.org>
+ * Copyright (c) 2000 Poul-Henning Kamp <phk@FreeBSD.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <string.h>
+#include <stdlib.h>
+
+void
+freezero(void *ptr, size_t sz)
+{
+	/* This is legal. */
+	if (ptr == NULL)
+		return;
+
+	explicit_bzero(ptr, sz);
+	free(ptr);
+}
diff --git a/configure.ac b/configure.ac
index f8b10f8..88884c2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,7 +39,7 @@ CHECK_OS_OPTIONS
 CHECK_CRYPTO_COMPAT
 
 # check functions that are expected to be in libc
-AC_CHECK_FUNCS([asprintf closefrom daemon memmem poll reallocarray])
+AC_CHECK_FUNCS([asprintf closefrom daemon freezero memmem poll reallocarray recallocarray])
 AC_CHECK_FUNCS([setproctitle setgroups])
 AC_CHECK_FUNCS([setregid setresgid setreuid setresuid])
 AC_CHECK_FUNCS([strlcat strlcpy strtonum sysconf])
@@ -95,11 +95,13 @@ AM_CONDITIONAL([HAVE_ASPRINTF], [test "x$ac_cv_func_asprintf" = xyes])
 AM_CONDITIONAL([HAVE_CLOSEFROM], [test "x$ac_cv_func_closefrom" = xyes])
 AM_CONDITIONAL([HAVE_DAEMON], [test "x$ac_cv_func_daemon" = xyes])
 AM_CONDITIONAL([HAVE_EXPLICIT_BZERO], [test "x$ac_cv_func_explicit_bzero" = xyes])
+AM_CONDITIONAL([HAVE_FREEZERO], [test "x$ac_cv_func_freezero" = xyes])
 AM_CONDITIONAL([HAVE_IFADDRS_H], [test "x$ac_cv_header_ifaddrs_h" = xyes])
 AM_CONDITIONAL([HAVE_IMSG], [test "x$ac_cv_func_ibuf_open" = xyes])
 AM_CONDITIONAL([HAVE_MEMMEM], [test "x$ac_cv_func_memmem" = xyes])
 AM_CONDITIONAL([HAVE_POLL], [test "x$ac_cv_func_poll" = xyes])
 AM_CONDITIONAL([HAVE_REALLOCARRAY], [test "x$ac_cv_func_reallocarray" = xyes])
+AM_CONDITIONAL([HAVE_RECALLOCARRAY], [test "x$ac_cv_func_recallocarray" = xyes])
 AM_CONDITIONAL([HAVE_SETGROUPS], [test "x$ac_cv_func_setgroups" = xyes])
 AM_CONDITIONAL([HAVE_SETRESGID], [test "x$ac_cv_func_setresgid" = xyes])
 AM_CONDITIONAL([HAVE_SETRESUID], [test "x$ac_cv_func_setresuid" = xyes])
diff --git a/include/stdlib.h b/include/stdlib.h
index 1033f66..3bcd203 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -24,10 +24,18 @@ uint32_t arc4random_uniform(uint32_t);
 int daemon(int nochdir, int noclose);
 #endif
 
+#ifndef HAVE_FREEZERO
+void freezero(void *ptr, size_t sz);
+#endif
+
 #ifndef HAVE_REALLOCARRAY
 void *reallocarray(void *, size_t, size_t);
 #endif
 
+#ifndef HAVE_RECALLOCARRAY
+void *recallocarray(void *, size_t, size_t, size_t);
+#endif
+
 #ifndef HAVE_SETPROCTITLE
 void compat_init_setproctitle(int argc, char *argv[]);
 void setproctitle(const char *fmt, ...);
diff --git a/update.sh b/update.sh
index b6bbb3d..c498fd7 100755
--- a/update.sh
+++ b/update.sh
@@ -45,6 +45,7 @@ for i in explicit_bzero.c strlcpy.c strlcat.c; do
 	$CP_LIBC $libc_src/string/$i compat
 done
 $CP_LIBC $libc_src/stdlib/reallocarray.c compat
+$CP_LIBC $libc_src/stdlib/recallocarray.c compat
 $CP_LIBC $libc_src/stdlib/strtonum.c compat
 $CP_LIBC $libc_src/crypt/arc4random.c compat
 $CP_LIBC $libc_src/crypt/arc4random_uniform.c compat