diff --git a/conversions/roman_numerals.py b/conversions/roman_numerals.py
index 02d184a05..61c3eb0bc 100644
--- a/conversions/roman_numerals.py
+++ b/conversions/roman_numerals.py
@@ -63,5 +63,5 @@ def int_to_roman(number: int) -> str:
     return "".join(result)
 
    if __name__ == "__main__":
-       import doctest
-       doctest.testmod()
+    import doctest
+    doctest.testmod()