diff --git a/StdLib/LibC/String/Copying.c b/StdLib/LibC/String/Copying.c
index 96be24b9a9..3234eccf08 100644
--- a/StdLib/LibC/String/Copying.c
+++ b/StdLib/LibC/String/Copying.c
@@ -39,6 +39,7 @@ memcpy(void * __restrict s1, const void * __restrict s2, size_t n)
 }
 #endif  /* !(defined(MDE_CPU_IPF) && defined(__GCC)) */
 
+#if !(defined(MDE_CPU_ARM) && defined(__GNUC__))
 /** The memmove function copies n characters from the object pointed to by s2
     into the object pointed to by s1. Copying takes place as if the n
     characters from the object pointed to by s2 are first copied into a
@@ -57,6 +58,7 @@ memmove(void *s1, const void *s2, size_t n)
 {
   return CopyMem( s1, s2, n);
 }
+#endif
 
 /** The strcpy function copies the string pointed to by s2 (including the
     terminating null character) into the array pointed to by s1. If copying
diff --git a/StdLib/LibC/String/Misc.c b/StdLib/LibC/String/Misc.c
index 99328252ed..f024136446 100644
--- a/StdLib/LibC/String/Misc.c
+++ b/StdLib/LibC/String/Misc.c
@@ -26,6 +26,7 @@
 
 extern char *sys_errlist[];
 
+#if !((defined(MDE_CPU_ARM) || defined(MDE_CPU_AARCH64)) && defined(__GNUC__))
 /** The memset function copies the value of c (converted to an unsigned char)
     into each of the first n characters of the object pointed to by s.
 
@@ -36,6 +37,7 @@ memset(void *s, int c, size_t n)
 {
   return SetMem( s, (UINTN)n, (UINT8)c);
 }
+#endif
 
 int
 strerror_r(int errnum, char *buf, size_t buflen)