Fix warning on 32bit.
diff --git a/cgminer.c b/cgminer.c
index b5f47dd..7816af3 100644
--- a/cgminer.c
+++ b/cgminer.c
@@ -238,7 +238,7 @@ static char datestamp[40];
static char blocktime[32];
struct timeval block_timeval;
static char best_share[8] = "0";
-double current_diff = 0xFFFFFFFFFFFFFFFF;
+double current_diff = 0xFFFFFFFFFFFFFFFFULL;
static char block_diff[8];
uint64_t best_diff = 0;