diff --git a/lib/string_calculator.dart b/lib/string_calculator.dart
index 763c5b6..5af6707 100644
--- a/lib/string_calculator.dart
+++ b/lib/string_calculator.dart
@@ -42,7 +42,7 @@ class StringCalculator {
 
     // Bug 3: Off-by-one in summation
     int sum = 0;
-    for (int i = 0; i < numList.length - 1; i++) { // Misses last element!
+    for (int i = 0; i < numList.length; i++) { // Fixed: Include last element
       sum += numList[i];
     }