bignum.cpp: Fix size warning.

diff --git a/vm/bignum.cpp b/vm/bignum.cpp
index 45024ba45ba37c495d9c480bae8162cabc4a01f1..cdb4d596cc351b910d4e24ce7c36eaf73b7cb029 100644 (file)
--- a/vm/bignum.cpp
+++ b/vm/bignum.cpp
@@ -1723,7 +1723,8 @@ bignum* factor_vm::bignum_gcd(bignum* a_, bignum* b_) {
   data_root<bignum> a(a_, this);
   data_root<bignum> b(b_, this);
   bignum_twodigit_type x, y, q, s, t, A, B, C, D;
-  int nbits, k;
+  unsigned long nbits;
+  int k;
   bignum_length_type size_a, size_b, size_c;
   bignum_digit_type* scan_a, *scan_b, *scan_c, *scan_d;
   bignum_digit_type* a_end, *b_end, *c_end;