diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index ed7929cbcd7..4aad0e1a075 100644
--- a/doc/src/sgml/wal.sgml
+++ b/doc/src/sgml/wal.sgml
@@ -109,9 +109,8 @@
         <literal>open_datasync</literal> (the default), write caching can be disabled
         by unchecking <literal>My Computer\Open\<replaceable>disk drive</replaceable>\Properties\Hardware\Properties\Policies\Enable write caching on the disk</literal>.
         Alternatively, set <varname>wal_sync_method</varname> to
-        <literal>fdatasync</literal> (NTFS only), <literal>fsync</literal> or
-        <literal>fsync_writethrough</literal>, which prevent
-        write caching.
+        <literal>fdatasync</literal> (NTFS only) or <literal>fsync</literal>,
+        which prevent write caching.
       </para>
     </listitem>
 
diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c
index 3c2a2fbef73..a027a8aabc2 100644
--- a/src/backend/storage/file/fd.c
+++ b/src/backend/storage/file/fd.c
@@ -399,7 +399,7 @@ pg_fsync(int fd)
 #endif
 
 	/* #if is to skip the sync_method test if there's no need for it */
-#if defined(HAVE_FSYNC_WRITETHROUGH) && !defined(FSYNC_WRITETHROUGH_IS_FSYNC)
+#if defined(HAVE_FSYNC_WRITETHROUGH)
 	if (sync_method == SYNC_METHOD_FSYNC_WRITETHROUGH)
 		return pg_fsync_writethrough(fd);
 	else
@@ -437,9 +437,7 @@ pg_fsync_writethrough(int fd)
 {
 	if (enableFsync)
 	{
-#ifdef WIN32
-		return _commit(fd);
-#elif defined(F_FULLFSYNC)
+#if defined(F_FULLFSYNC)
 		return (fcntl(fd, F_FULLFSYNC, 0) == -1) ? -1 : 0;
 #else
 		errno = ENOSYS;
diff --git a/src/bin/pg_test_fsync/pg_test_fsync.c b/src/bin/pg_test_fsync/pg_test_fsync.c
index 435df8d808d..14fa4acae26 100644
--- a/src/bin/pg_test_fsync/pg_test_fsync.c
+++ b/src/bin/pg_test_fsync/pg_test_fsync.c
@@ -605,9 +605,7 @@ signal_cleanup(SIGNAL_ARGS)
 static int
 pg_fsync_writethrough(int fd)
 {
-#ifdef WIN32
-	return _commit(fd);
-#elif defined(F_FULLFSYNC)
+#if defined(F_FULLFSYNC)
 	return (fcntl(fd, F_FULLFSYNC, 0) == -1) ? -1 : 0;
 #else
 	errno = ENOSYS;
diff --git a/src/include/port/win32_port.h b/src/include/port/win32_port.h
index 0e6d6083308..27a11c7868e 100644
--- a/src/include/port/win32_port.h
+++ b/src/include/port/win32_port.h
@@ -84,14 +84,6 @@
 /* Windows doesn't have fsync() as such, use _commit() */
 #define fsync(fd) _commit(fd)
 
-/*
- * For historical reasons, we allow setting wal_sync_method to
- * fsync_writethrough on Windows, even though it's really identical to fsync
- * (both code paths wind up at _commit()).
- */
-#define HAVE_FSYNC_WRITETHROUGH
-#define FSYNC_WRITETHROUGH_IS_FSYNC
-
 #define USES_WINSOCK
 
 /*