1 files changed, 3 insertions, 4 deletions
diff --git a/libtommath/bn_mp_div_d.c b/libtommath/bn_mp_div_d.c
index a2022ad..05f08c7 100644
--- a/libtommath/bn_mp_div_d.c
+++ b/libtommath/bn_mp_div_d.c
@@ -19,12 +19,11 @@ static int s_is_power_of_two(mp_digit b, int *p)
 {
    int x;
 
-   /* fast return if no power of two */
+   /* quick out - if (b & (b-1)) isn't zero, b isn't a power of two */
    if ((b == 0) || ((b & (b-1)) != 0)) {
-      return 0;
+       return 0;
    }
-
-   for (x = 0; x < DIGIT_BIT; x++) {
+   for (x = 1; x < DIGIT_BIT; x++) {
       if (b == (((mp_digit)1)<<x)) {
          *p = x;
          return 1;