diff --git a/lib/roman_numerals.dart b/lib/roman_numerals.dart
index 9ba01a9..5c084ea 100644
--- a/lib/roman_numerals.dart
+++ b/lib/roman_numerals.dart
@@ -1,5 +1,5 @@
 String integerToRoman(int number) {
-  const romanSymbols = {8: 'VIII', 7: 'VII', 6: 'VI', 5: 'V', 1: 'I'};
+  const romanSymbols = {9: 'IX', 8: 'VIII', 7: 'VII', 6: 'VI', 5: 'V', 1: 'I'};
 
   if (_isSubtractiveCase(number)) {
     return romanSymbols[1]! + romanSymbols[5]!;