diff --git a/configure b/configure
index d9095b568a0..4ba0a97dd6b 100755
--- a/configure
+++ b/configure
@@ -16310,7 +16310,7 @@ fi
 LIBS_including_readline="$LIBS"
 LIBS=`echo "$LIBS" | sed -e 's/-ledit//g' -e 's/-lreadline//g'`
 
-for ac_func in backtrace_symbols clock_gettime copyfile fdatasync getifaddrs getpeerucred getrlimit inet_pton kqueue mbstowcs_l memset_s poll posix_fallocate ppoll pstat pthread_is_threaded_np readlink readv setproctitle setproctitle_fast setsid shm_open strsignal symlink syncfs sync_file_range uselocale wcstombs_l writev
+for ac_func in backtrace_symbols clock_gettime copyfile fdatasync getifaddrs getpeerucred getrlimit inet_pton kqueue mbstowcs_l poll posix_fallocate ppoll pstat pthread_is_threaded_np readlink readv setproctitle setproctitle_fast setsid shm_open strsignal symlink syncfs sync_file_range uselocale wcstombs_l writev
 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"
@@ -16944,6 +16944,19 @@ 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 257c66859bb..3f67eb9c85d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1843,7 +1843,6 @@ AC_CHECK_FUNCS(m4_normalize([
 	inet_pton
 	kqueue
 	mbstowcs_l
-	memset_s
 	poll
 	posix_fallocate
 	ppoll
@@ -1924,6 +1923,8 @@ 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/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 6d5e1820c9d..676e7bea16d 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -126,6 +126,10 @@
    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
@@ -383,9 +387,6 @@
 /* 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 the system has the type `MINIDUMP_TYPE'. */
 #undef HAVE_MINIDUMP_TYPE
 
diff --git a/src/port/explicit_bzero.c b/src/port/explicit_bzero.c
index 0d504eb6395..6e742275f8f 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)
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 6db8a10265f..4ce258ef6c3 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -240,6 +240,7 @@ sub GenerateFiles
 		HAVE_DECL_LLVMGETHOSTCPUNAME                => 0,
 		HAVE_DECL_LLVMGETHOSTCPUFEATURES            => 0,
 		HAVE_DECL_LLVMORCGETSYMBOLADDRESSIN         => 0,
+		HAVE_DECL_MEMSET_S                          => 0,
 		HAVE_DECL_POSIX_FADVISE                     => 0,
 		HAVE_DECL_PREADV                            => 0,
 		HAVE_DECL_PWRITEV                           => 0,
@@ -321,7 +322,6 @@ sub GenerateFiles
 		HAVE_MBARRIER_H             => undef,
 		HAVE_MBSTOWCS_L             => 1,
 		HAVE_MEMORY_H               => 1,
-		HAVE_MEMSET_S               => undef,
 		HAVE_MINIDUMP_TYPE          => 1,
 		HAVE_MKDTEMP                => undef,
 		HAVE_NETINET_TCP_H          => undef,