diff --git a/src/mdevaluate/checksum.py b/src/mdevaluate/checksum.py
index fa6d85f..21f967b 100755
--- a/src/mdevaluate/checksum.py
+++ b/src/mdevaluate/checksum.py
@@ -8,6 +8,7 @@ import ast
 import io
 import tokenize
 import re
+import textwrap
 
 import numpy as np
 
@@ -45,7 +46,7 @@ def strip_comments(source: str) -> str:
         for child in ast.iter_child_nodes(node):
             remove_docstrings(child)
 
-    tree = ast.parse(source)
+    tree = ast.parse(textwrap.dedent(source))
     remove_docstrings(tree)
     code_without_docstrings = ast.unparse(tree)