diff --git a/configure b/configure
index c4f1674441f..eb05eaa227d 100755
--- a/configure
+++ b/configure
@@ -15715,7 +15715,7 @@ fi
 LIBS_including_readline="$LIBS"
 LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
 
-for ac_func in backtrace_symbols copyfile getifaddrs getpeerucred inet_pton kqueue mbstowcs_l memset_s posix_fallocate ppoll pthread_is_threaded_np setproctitle setproctitle_fast strsignal syncfs sync_file_range uselocale wcstombs_l
+for ac_func in backtrace_symbols copyfile getifaddrs getpeerucred inet_pton kqueue mbstowcs_l posix_fallocate ppoll pthread_is_threaded_np setproctitle setproctitle_fast strsignal syncfs sync_file_range uselocale wcstombs_l
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
@@ -16291,6 +16291,19 @@ cat >>confdefs.h <<_ACEOF
 #define HAVE_DECL_STRCHRNUL $ac_have_decl
 _ACEOF
 
+ac_fn_c_check_decl "$LINENO" "memset_s" "ac_cv_have_decl_memset_s" "#define __STDC_WANT_LIB_EXT1__ 1
+#include <string.h>
+"
+if test "x$ac_cv_have_decl_memset_s" = xyes; then :
+  ac_have_decl=1
+else
+  ac_have_decl=0
+fi
+
+cat >>confdefs.h <<_ACEOF
+#define HAVE_DECL_MEMSET_S $ac_have_decl
+_ACEOF
+
 
 # This is probably only present on macOS, but may as well check always
 ac_fn_c_check_decl "$LINENO" "F_FULLFSYNC" "ac_cv_have_decl_F_FULLFSYNC" "#include <fcntl.h>
diff --git a/configure.ac b/configure.ac
index 2b87df7c121..ca75eb00f5e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1803,7 +1803,6 @@ AC_CHECK_FUNCS(m4_normalize([
 	inet_pton
 	kqueue
 	mbstowcs_l
-	memset_s
 	posix_fallocate
 	ppoll
 	pthread_is_threaded_np
@@ -1849,6 +1848,8 @@ AC_CHECK_DECLS([strlcat, strlcpy, strnlen])
 AC_CHECK_DECLS([preadv], [], [AC_LIBOBJ(preadv)], [#include <sys/uio.h>])
 AC_CHECK_DECLS([pwritev], [], [AC_LIBOBJ(pwritev)], [#include <sys/uio.h>])
 AC_CHECK_DECLS([strchrnul], [], [], [#include <string.h>])
+AC_CHECK_DECLS([memset_s], [], [], [#define __STDC_WANT_LIB_EXT1__ 1
+#include <string.h>])
 
 # This is probably only present on macOS, but may as well check always
 AC_CHECK_DECLS(F_FULLFSYNC, [], [], [#include <fcntl.h>])
diff --git a/meson.build b/meson.build
index 5422ab64a3d..a8b0f1ecc9f 100644
--- a/meson.build
+++ b/meson.build
@@ -2324,26 +2324,29 @@ decl_checks += [
   ['preadv', 'sys/uio.h'],
   ['pwritev', 'sys/uio.h'],
   ['strchrnul', 'string.h'],
+  ['memset_s', 'string.h', '#define __STDC_WANT_LIB_EXT1__ 1'],
 ]
 
 foreach c : decl_checks
   func = c.get(0)
   header = c.get(1)
-  args = c.get(2, {})
+  prologue = c.get(2, '')
+  args = c.get(3, {})
   varname = 'HAVE_DECL_' + func.underscorify().to_upper()
 
   found = cc.compiles('''
-#include <@0@>
+@0@
+#include <@1@>
 
 int main()
 {
-#ifndef @1@
-    (void) @1@;
+#ifndef @2@
+    (void) @2@;
 #endif
 
 return 0;
 }
-'''.format(header, func),
+'''.format(prologue, header, func),
     name: 'test whether @0@ is declared'.format(func),
     # need to add cflags_warn to get at least
     # -Werror=unguarded-availability-new if applicable
@@ -2581,7 +2584,6 @@ func_checks = [
   ['inet_pton'],
   ['kqueue'],
   ['mbstowcs_l'],
-  ['memset_s'],
   ['mkdtemp'],
   ['posix_fadvise'],
   ['posix_fallocate'],
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index a27cb325aa3..be27b8abe10 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -116,6 +116,10 @@
    to 0 if you don't. */
 #undef HAVE_DECL_LLVMORCGETSYMBOLADDRESSIN
 
+/* Define to 1 if you have the declaration of `memset_s', and to 0 if you
+   don't. */
+#undef HAVE_DECL_MEMSET_S
+
 /* Define to 1 if you have the declaration of `posix_fadvise', and to 0 if you
    don't. */
 #undef HAVE_DECL_POSIX_FADVISE
@@ -317,9 +321,6 @@
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 
-/* Define to 1 if you have the `memset_s' function. */
-#undef HAVE_MEMSET_S
-
 /* Define to 1 if you have the `mkdtemp' function. */
 #undef HAVE_MKDTEMP
 
diff --git a/src/port/explicit_bzero.c b/src/port/explicit_bzero.c
index f3a5038aa76..4ac632c2b45 100644
--- a/src/port/explicit_bzero.c
+++ b/src/port/explicit_bzero.c
@@ -12,9 +12,11 @@
  *-------------------------------------------------------------------------
  */
 
+#define __STDC_WANT_LIB_EXT1__ 1	/* needed to access memset_s() */
+
 #include "c.h"
 
-#if defined(HAVE_MEMSET_S)
+#if HAVE_DECL_MEMSET_S
 
 void
 explicit_bzero(void *buf, size_t len)