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diff --git a/winsup/mingw/mingwex/wmemmove.c b/winsup/mingw/mingwex/wmemmove.c
new file mode 100644
index 0000000000..3c545ac320
--- /dev/null
+++ b/winsup/mingw/mingwex/wmemmove.c
@@ -0,0 +1,43 @@
+/*	This source code was extracted from the Q8 package created and placed
+    in the PUBLIC DOMAIN by Doug Gwyn <gwyn@arl.mil>
+    last edit:	1999/11/05	gwyn@arl.mil
+
+    Implements subclause 7.24 of ISO/IEC 9899:1999 (E).
+
+	It supports an encoding where all char codes are mapped
+	to the *same* code values within a wchar_t or wint_t,
+	so long as no other wchar_t codes are used by the program.
+
+*/
+
+#include	<errno.h>
+#include	<stdio.h>
+#include	<stdlib.h>
+#include	<wchar.h>
+
+wchar_t *
+wmemmove(s1, s2, n)
+	register wchar_t		*s1;
+	register const wchar_t	*s2;
+	register size_t			n;
+	{
+	wchar_t				*orig_s1 = s1;
+
+	if ( s1 == NULL || s2 == NULL || n == 0 )
+		return orig_s1;		/* robust */
+
+	/* XXX -- The following test works only within a flat address space! */
+	if ( s2 >= s1 )
+		for ( ; n > 0; --n )
+			*s1++ = *s2++;
+	else	{
+		s1 += n;
+		s2 += n;
+
+		for ( ; n > 0; --n )
+			*--s1 = *--s2;
+		}
+
+	return orig_s1;
+	}
+