X-Git-Url: https://git.distorted.org.uk/~mdw/catacomb/blobdiff_plain/0f00dc4c8eb47e67bc0f148c2dd109f73a451e0a..646d0305bfee5d72982ce01151989797b0f5f139:/math/mp-arith.c

diff --git a/math/mp-arith.c b/math/mp-arith.c
index 2d7d6359..61780b0f 100644
--- a/math/mp-arith.c
+++ b/math/mp-arith.c
@@ -116,7 +116,7 @@ mp *mp_lsr2c(mp *d, mp *a, size_t n)
 
 int mp_testbit(mp *x, unsigned long n)
 {
-  if (n > MPW_BITS * MP_LEN(x))
+  if (n >= MPW_BITS * MP_LEN(x))
     return (0);
   return ((x->v[n/MPW_BITS] >> n%MPW_BITS) & 1u);
 }