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-rw-r--r--stdio-common/printf_fp.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/stdio-common/printf_fp.c b/stdio-common/printf_fp.c
index 62867e75f2..ed225e05a6 100644
--- a/stdio-common/printf_fp.c
+++ b/stdio-common/printf_fp.c
@@ -430,7 +430,9 @@ __printf_fp (FILE *fp,
      would be really big it could lead to memory problems.  */
   {
     mp_size_t bignum_size = ((ABS (exponent) + BITS_PER_MP_LIMB - 1)
-			     / BITS_PER_MP_LIMB + 4) * sizeof (mp_limb_t);
+			     / BITS_PER_MP_LIMB
+			     + (LDBL_MANT_DIG / BITS_PER_MP_LIMB > 2 ? 8 : 4))
+			    * sizeof (mp_limb_t);
     frac = (mp_limb_t *) alloca (bignum_size);
     tmp = (mp_limb_t *) alloca (bignum_size);
     scale = (mp_limb_t *) alloca (bignum_size);