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-rw-r--r--src/lngamma.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/lngamma.c b/src/lngamma.c
index 682888601..d07ea033e 100644
--- a/src/lngamma.c
+++ b/src/lngamma.c
@@ -490,7 +490,7 @@ GAMMA_FUNC (mpfr_ptr y, mpfr_srcptr z0, mpfr_rnd_t rnd)
mpfr_mul (u, u, u, MPFR_RNDN); /* 1/z^2 * (1+u)^3 */
/* m <= maxm ensures that 2*m*(2*m+1) <= ULONG_MAX */
- maxm = 1UL << (GMP_NUMB_BITS / 2 - 1);
+ maxm = 1UL << (sizeof(unsigned long) * CHAR_BIT / 2 - 1);
/* s:(1+u)^15, t:(1+u)^2, t <= 3/128 */