diff --git a/src/bitmsghash/bitmsghash.cl b/src/bitmsghash/bitmsghash.cl
index 1ab5d219..3c8c21a5 100644
--- a/src/bitmsghash/bitmsghash.cl
+++ b/src/bitmsghash/bitmsghash.cl
@@ -24,9 +24,8 @@
 
 
 /// Warning: This version of SWAP64(n) is slow and avoid bugs on AMD GPUs(7970)
-#define SWAP64(n)       as_ulong(as_uchar8(n).s76543210)
+// #define SWAP64(n)       as_ulong(as_uchar8(n).s76543210)
 
-/*
 #define SWAP64(n) \
   (((n) << 56)					\
    | (((n) & 0xff00) << 40)			\
@@ -36,7 +35,6 @@
    | (((n) >> 24) & 0xff0000)			\
    | (((n) >> 40) & 0xff00)			\
    | ((n) >> 56))
-*/