diff --git a/lib/data_mapper/validation/rule/numericalness.rb b/lib/data_mapper/validation/rule/numericalness.rb
index 414e5c68..fb664f84 100644
--- a/lib/data_mapper/validation/rule/numericalness.rb
+++ b/lib/data_mapper/validation/rule/numericalness.rb
@@ -68,7 +68,7 @@ def valid?(resource)
         def value_as_string(value)
           case value
           # Avoid Scientific Notation in Float to_s
-          when Float      then value.to_d.to_s('F')
+          when Float      then value.to_d(options.fetch(:precision, nil)).to_s('F')
           when BigDecimal then value.to_s('F')
           else value.to_s
           end