diff --git a/snappy.cc b/snappy.cc
index 4bcea0b..2db94b7 100644
--- a/snappy.cc
+++ b/snappy.cc
@@ -89,7 +89,7 @@ size_t MaxCompressedLength(size_t source_len) {
 namespace {
 
 void UnalignedCopy64(const void* src, void* dst) {
-  memcpy(dst, src, 8);
+  memmove(dst, src, 8);
 }
 
 void UnalignedCopy128(const void* src, void* dst) {