diff --git a/lib/decimal.dart b/lib/decimal.dart
index 6a3ccbb..a81424f 100644
--- a/lib/decimal.dart
+++ b/lib/decimal.dart
@@ -284,9 +284,17 @@ class Decimal implements Comparable<Decimal> {
       value = (value / ten).toDecimal();
       eValue++;
     }
+    value = value.round(scale: fractionDigits);
+    // If the rounded value is 10, then divide it once more to make it follow
+    // the normalized scientific notation. See https://github.com/a14n/dart-decimal/issues/74
+    if (value == ten) {
+      value = (value / ten).toDecimal();
+      eValue++;
+    }
+
     return <String>[
       if (negative) '-',
-      value.round(scale: fractionDigits).toStringAsFixed(fractionDigits),
+      value.toStringAsFixed(fractionDigits),
       'e',
       if (eValue >= 0) '+',
       '$eValue',
diff --git a/test/decimal_test.dart b/test/decimal_test.dart
index b5f59d4..170886f 100644
--- a/test/decimal_test.dart
+++ b/test/decimal_test.dart
@@ -308,6 +308,8 @@ void main() {
     // issue https://github.com/a14n/dart-decimal/issues/48
     expectThat(dec('1.7976931348623157e+310').toStringAsExponential(10))
         .equals('1.7976931349e+310');
+    // issue https://github.com/a14n/dart-decimal/issues/74
+    expectThat(dec('9.9999e+7').toStringAsExponential(2)).equals('1.00e+8');
   });
   test('toStringAsPrecision(int precision)', () {
     expectThat(dec('0').toStringAsPrecision(1)).equals('0');