diff --git a/decimal.go b/decimal.go
index bfb7699..8ae929e 100644
--- a/decimal.go
+++ b/decimal.go
@@ -86,11 +86,15 @@ func NewFromString(value string) (Decimal, error) {
 	// Check if number is using scientific notation
 	eIndex := strings.IndexAny(value, "Ee")
 	if eIndex != -1 {
-		expInt, err := strconv.ParseInt(value[eIndex+1:len(value)], 10, 64)
+		expInt, err := strconv.ParseInt(value[eIndex+1:], 10, 32)
 		if err != nil {
+			rerr := err.(*strconv.NumError)
+			if rerr.Err == strconv.ErrRange {
+				return Decimal{}, fmt.Errorf("can't convert %s to decimal: fractional part too long", value)
+			}
 			return Decimal{}, fmt.Errorf("can't convert %s to decimal: exponent is not numeric", value)
 		}
-		value = value[0:eIndex]
+		value = value[:eIndex]
 		exp = expInt
 	}
 
diff --git a/decimal_test.go b/decimal_test.go
index d9839b0..f8fff74 100644
--- a/decimal_test.go
+++ b/decimal_test.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"encoding/xml"
 	"math"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -135,6 +136,7 @@ func TestNewFromStringErrs(t *testing.T) {
 		"123.456e1.3",
 		"1e-1.2",
 		"123.456e-1.3",
+		"123.456e" + strconv.FormatInt(math.MinInt64, 10),
 	}
 
 	for _, s := range tests {