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-rw-r--r--libtommath/bn_mp_div_d.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/libtommath/bn_mp_div_d.c b/libtommath/bn_mp_div_d.c
index f2729d2..af18d0a 100644
--- a/libtommath/bn_mp_div_d.c
+++ b/libtommath/bn_mp_div_d.c
@@ -20,7 +20,7 @@ static int s_is_power_of_two(mp_digit b, int *p)
int x;
/* quick out - if (b & (b-1)) isn't zero, b isn't a power of two */
- if ((b & (b-1)) != 0) {
+ if ((b==0) || (b & (b-1))) {
return 0;
}
for (x = 1; x < DIGIT_BIT; x++) {