diff --git a/isort/core.py b/isort/core.py
index bff28458..291336b8 100644
--- a/isort/core.py
+++ b/isort/core.py
@@ -510,4 +510,4 @@ def _has_changed(before: str, after: str, line_separator: str, ignore_whitespace
             remove_whitespace(before, line_separator=line_separator).strip()
             != remove_whitespace(after, line_separator=line_separator).strip()
         )
-    return before.strip() != after.strip()
+    return before != after