diff --git a/string/aarch64/memcpy.S b/string/aarch64/memcpy.S
index dd254f6f9929a3986a0c60473df66d573d836092..8a967cdf4d2b5c014ce0737c19e4884297cd18b7 100644
--- a/string/aarch64/memcpy.S
+++ b/string/aarch64/memcpy.S
@@ -58,6 +58,7 @@ ENTRY (__memcpy_aarch64)
 	PTR_ARG (0)
 	PTR_ARG (1)
 	SIZE_ARG (2)
+	prfm	PLDL1KEEP, [src]
 	add	srcend, src, count
 	add	dstend, dstin, count
 	cmp	count, 128