diff --git a/lib/roman_numerals.dart b/lib/roman_numerals.dart
index ef9f436..a962a11 100644
--- a/lib/roman_numerals.dart
+++ b/lib/roman_numerals.dart
@@ -3,7 +3,12 @@ String integerToRoman(int number) {
   for (int i = 0; i < number; i++) {
     if (number == 5) {
       result += 'V';
-      break;
+      return result;
+    }
+
+    if (number == 4) {
+      result += 'IV';
+      return result;
     }
 
     result += 'I';