1 files changed, 4 insertions, 2 deletions
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 5af8441300..c7d9945a15 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -1222,8 +1222,10 @@ BigDecimal_divide(Real **c, Real **res, Real **div, VALUE self, VALUE r)
 
     *div = b;
     mx = a->Prec + vabs(a->exponent);
-    if (mx<b->Prec + vabs(b->exponent)) mx = b->Prec + vabs(b->exponent);
-    mx =(mx + 1) * VpBaseFig();
+    if (mx < b->Prec + vabs(b->exponent)) mx = b->Prec + vabs(b->exponent);
+    mx++; /* NOTE: An additional digit is needed for the compatibility to
+                   the version 1.2.1 and the former.  */
+    mx = (mx + 1) * VpBaseFig();
     GUARD_OBJ((*c), VpCreateRbObject(mx, "#0"));
     GUARD_OBJ((*res), VpCreateRbObject((mx+1) * 2 +(VpBaseFig() + 1), "#0"));
     VpDivd(*c, *res, a, b);