Index: b/Python/pyhash.c
===================================================================
--- a/Python/pyhash.c
+++ b/Python/pyhash.c
@@ -328,20 +328,21 @@ static PyHash_FuncDef PyHash_Func = {fnv
  * the hash values' least significant bits.
  */
 #if PY_LITTLE_ENDIAN
-#  define _le64toh(x) ((uint64_t)(x))
+#  define _le64toh(v, x) memcpy(&v, x, sizeof(v))
 #elif defined(__APPLE__)
-#  define _le64toh(x) OSSwapLittleToHostInt64(x)
+#  define _le64toh(v, x) v = OSSwapLittleToHostInt64(*x)
 #elif defined(HAVE_LETOH64)
-#  define _le64toh(x) le64toh(x)
+#  define _le64toh(v, x) v = le64toh(*x)
 #else
-#  define _le64toh(x) (((uint64_t)(x) << 56) | \
-                      (((uint64_t)(x) << 40) & 0xff000000000000ULL) | \
-                      (((uint64_t)(x) << 24) & 0xff0000000000ULL) | \
-                      (((uint64_t)(x) << 8)  & 0xff00000000ULL) | \
-                      (((uint64_t)(x) >> 8)  & 0xff000000ULL) | \
-                      (((uint64_t)(x) >> 24) & 0xff0000ULL) | \
-                      (((uint64_t)(x) >> 40) & 0xff00ULL) | \
-                      ((uint64_t)(x)  >> 56))
+#  define _le64toh(v, x) v = \
+                      (((uint64_t)(*x) << 56) |			      \
+                      (((uint64_t)(*x) << 40) & 0xff000000000000ULL) | \
+                      (((uint64_t)(*x) << 24) & 0xff0000000000ULL) | \
+                      (((uint64_t)(*x) << 8)  & 0xff00000000ULL) | \
+                      (((uint64_t)(*x) >> 8)  & 0xff000000ULL) | \
+                      (((uint64_t)(*x) >> 24) & 0xff0000ULL) | \
+                      (((uint64_t)(*x) >> 40) & 0xff00ULL) | \
+                      ((uint64_t)(*x)  >> 56))
 #endif
 
 
@@ -381,7 +382,8 @@ siphash24(const void *src, Py_ssize_t sr
     uint8_t *m;
 
     while (src_sz >= 8) {
-        uint64_t mi = _le64toh(*in);
+        uint64_t mi;
+        _le64toh(mi, in);
         in += 1;
         src_sz -= 8;
         v3 ^= mi;