Index: bignum.c
===================================================================
--- bignum.c	(revision 41265)
+++ bignum.c	(working copy)
@@ -1120,7 +1120,7 @@ rb_integer_pack_2comp(VALUE val, void *w
 }
 
 static size_t
-integer_unpack_num_bdigits_small(size_t numwords, size_t wordsize, size_t nails, int *nlp_bits_ret)
+integer_unpack_num_bdigits_small(size_t numwords, size_t wordsize, size_t nails, size_t *nlp_bits_ret)
 {
     /* nlp_bits stands for number of leading padding bits */
     size_t num_bits = (wordsize * CHAR_BIT - nails) * numwords;
@@ -1130,7 +1130,7 @@ integer_unpack_num_bdigits_small(size_t 
 }
 
 static size_t
-integer_unpack_num_bdigits_generic(size_t numwords, size_t wordsize, size_t nails, int *nlp_bits_ret)
+integer_unpack_num_bdigits_generic(size_t numwords, size_t wordsize, size_t nails, size_t *nlp_bits_ret)
 {
     /* BITSPERDIG = SIZEOF_BDIGITS * CHAR_BIT */
     /* num_bits = (wordsize * CHAR_BIT - nails) * numwords */
@@ -1202,7 +1202,7 @@ integer_unpack_push_bits(int data, int n
 }
 
 static VALUE
-rb_integer_unpack_internal(const void *words, size_t numwords, size_t wordsize, size_t nails, int flags, int *nlp_bits_ret)
+rb_integer_unpack_internal(const void *words, size_t numwords, size_t wordsize, size_t nails, int flags, size_t *nlp_bits_ret)
 {
     VALUE result;
     const unsigned char *buf = words;
@@ -1309,7 +1309,7 @@ rb_integer_unpack_internal(const void *w
 VALUE
 rb_integer_unpack(const void *words, size_t numwords, size_t wordsize, size_t nails, int flags)
 {
-    int nlp_bits;
+    size_t nlp_bits;
     VALUE val;
 
     validate_integer_pack_format(numwords, wordsize, nails, flags,
@@ -1356,7 +1356,7 @@ VALUE
 rb_integer_unpack_2comp(const void *words, size_t numwords, size_t wordsize, size_t nails, int flags)
 {
     VALUE val;
-    int nlp_bits;
+    size_t nlp_bits;
 
     validate_integer_pack_format(numwords, wordsize, nails, flags,
             INTEGER_PACK_MSWORD_FIRST|