diff --git a/ChangeLog b/ChangeLog
index 4aa393a29915ffdf0e137a61ba93d0b84e2828e9..d2c8e6d1dec10db15b0c4f97f739ac8c76f46732 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2012-11-15  Niels Möller  <nisse@lysator.liu.se>
+
+	* macros.h (LE_READ_UINT64): New macro.
+
 2012-11-13  Niels Möller  <nisse@lysator.liu.se>
 
 	* sha3-permute.c (sha3_permute): Micro optimizations. Partial
diff --git a/macros.h b/macros.h
index dee35f8f0a3b30a7dffb612216112f62148c8d45..ee2060431d6d2f0dcde6ea69b55b9ccfb74f2ba2 100644
--- a/macros.h
+++ b/macros.h
@@ -87,6 +87,16 @@ do {						\
 } while(0)
 
 /* And the other, little-endian, byteorder */
+#define LE_READ_UINT64(p)			\
+(  (((uint64_t) (p)[7]) << 56)			\
+ | (((uint64_t) (p)[6]) << 48)			\
+ | (((uint64_t) (p)[5]) << 40)			\
+ | (((uint64_t) (p)[4]) << 32)			\
+ | (((uint64_t) (p)[3]) << 24)			\
+ | (((uint64_t) (p)[2]) << 16)			\
+ | (((uint64_t) (p)[1]) << 8)			\
+ |  ((uint64_t) (p)[0]))
+
 #define LE_WRITE_UINT64(p, i)			\
 do {						\
   (p)[7] = ((i) >> 56) & 0xff;			\