1 files changed, 1 insertions, 0 deletions
diff --git a/src/numeric.c b/src/numeric.c
index 4288df44a..a1299a74f 100644
--- a/src/numeric.c
+++ b/src/numeric.c
@@ -702,6 +702,7 @@ flo_round(mrb_state *mrb, mrb_value num)
 
   f = 1.0;
   i = ndigits >= 0 ? ndigits : -ndigits;
+  if (ndigits > DBL_DIG+2) return num;
   while  (--i >= 0)
     f = f*10.0;