diff --git a/configure b/configure
index 4041051d59..8d38e792aa 100755
--- a/configure
+++ b/configure
@@ -14925,7 +14925,7 @@ 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 kqueue mbstowcs_l memset_s memmove poll posix_fallocate ppoll pstat pthread_is_threaded_np readlink setproctitle setproctitle_fast setsid shm_open strchrnul strsignal symlink sync_file_range uselocale utime utimes wcstombs_l
+for ac_func in backtrace_symbols clock_gettime copyfile fdatasync getifaddrs getpeerucred getrlimit kqueue mbstowcs_l memset_s poll posix_fallocate ppoll pstat pthread_is_threaded_np readlink setproctitle setproctitle_fast setsid shm_open strchrnul strsignal symlink sync_file_range uselocale utime utimes 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"
diff --git a/configure.in b/configure.in
index 7660c77767..86b1d298c6 100644
--- a/configure.in
+++ b/configure.in
@@ -1627,7 +1627,6 @@ AC_CHECK_FUNCS(m4_normalize([
 	kqueue
 	mbstowcs_l
 	memset_s
-	memmove
 	poll
 	posix_fallocate
 	ppoll
diff --git a/src/include/c.h b/src/include/c.h
index 2e8b2d4e3f..f2cc0338de 100644
--- a/src/include/c.h
+++ b/src/include/c.h
@@ -1261,10 +1261,6 @@ extern long long strtoll(const char *str, char **endptr, int base);
 extern unsigned long long strtoull(const char *str, char **endptr, int base);
 #endif
 
-#if !defined(HAVE_MEMMOVE) && !defined(memmove)
-#define memmove(d, s, c)		bcopy(s, d, c)
-#endif
-
 /* no special DLL markers on most ports */
 #ifndef PGDLLIMPORT
 #define PGDLLIMPORT
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 9de9ae6631..ef4c175c98 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -370,9 +370,6 @@
 /* Define to 1 if you have the `mbstowcs_l' function. */
 #undef HAVE_MBSTOWCS_L
 
-/* Define to 1 if you have the `memmove' function. */
-#undef HAVE_MEMMOVE
-
 /* Define to 1 if you have the <memory.h> header file. */
 #undef HAVE_MEMORY_H
 
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 81b0bf2128..56d52fc331 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -294,7 +294,6 @@ sub GenerateFiles
 		HAVE_LONG_LONG_INT_64       => 1,
 		HAVE_MBARRIER_H             => undef,
 		HAVE_MBSTOWCS_L             => 1,
-		HAVE_MEMMOVE                => 1,
 		HAVE_MEMORY_H               => 1,
 		HAVE_MEMSET_S               => undef,
 		HAVE_MINIDUMP_TYPE          => 1,