1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/libcrypto/bn/bn_shift.c b/src/lib/libcrypto/bn/bn_shift.c
index 61aae65a6b..0883247384 100644
--- a/src/lib/libcrypto/bn/bn_shift.c
+++ b/src/lib/libcrypto/bn/bn_shift.c
@@ -162,7 +162,7 @@ int BN_rshift(BIGNUM *r, BIGNUM *a, int n)
         nw=n/BN_BITS2;
         rb=n%BN_BITS2;
         lb=BN_BITS2-rb;
-        if (nw > a->top)
+        if (nw > a->top || a->top == 0)
                 {
                 BN_zero(r);
                 return(1);