diff --git a/src/stringcalculator.py b/src/stringcalculator.py
index a1463b3c7c433283b37efb5099204564f965fd7b..4b8e76f33e53fb4ef8cdc900d5930821fb39baed 100644
--- a/src/stringcalculator.py
+++ b/src/stringcalculator.py
@@ -27,4 +27,6 @@ class StringCalculator(IStringCalculator):
         if negative_numbers:
             raise ValueError(f"Negative nicht erlaubt: {negative_numbers}")
 
+        numbers_list = [num for num in numbers_list if num <= 1000]
+
         return sum(numbers_list)
\ No newline at end of file
diff --git a/tests/test_stringclaculator.py b/tests/test_stringclaculator.py
index d72bf6e90b5ea741a43520258665a7a5df6c2cb0..a0c1d7668215796feb20d932160f840f2e5a09db 100644
--- a/tests/test_stringclaculator.py
+++ b/tests/test_stringclaculator.py
@@ -67,6 +67,10 @@ class TestStringCalculator(unittest.TestCase):
             self.calculator.add("//;1;2")
         print(str(context.exception))
 
+    def test_ignore_numbers_greater_than_1000(self):
+        self.assertEqual(self.calculator.add("2,1001"), 2)
+        self.assertEqual(self.calculator.add("1002,50200"), 0)
+
 if __name__ == "__main__":
     unittest.main()