diff --git a/arch/ia64/sn/kernel/bte.c b/arch/ia64/sn/kernel/bte.c
index 7f73ad4408aa..ff1c55601178 100644
--- a/arch/ia64/sn/kernel/bte.c
+++ b/arch/ia64/sn/kernel/bte.c
@@ -381,14 +381,13 @@ bte_result_t bte_unaligned_copy(u64 src, u64 dest, u64 len, u64 mode)
 		 * bcopy to the destination.
 		 */
 
-		/* Add the leader from source */
-		headBteLen = len + (src & L1_CACHE_MASK);
-		/* Add the trailing bytes from footer. */
-		headBteLen += L1_CACHE_BYTES - (headBteLen & L1_CACHE_MASK);
-		headBteSource = src & ~L1_CACHE_MASK;
 		headBcopySrcOffset = src & L1_CACHE_MASK;
 		headBcopyDest = dest;
 		headBcopyLen = len;
+
+		headBteSource = src - headBcopySrcOffset;
+		/* Add the leading and trailing bytes from source */
+		headBteLen = L1_CACHE_ALIGN(len + headBcopySrcOffset);
 	}
 
 	if (headBcopyLen > 0) {