diff --git a/tartufo/scanner.py b/tartufo/scanner.py
index c8f0ff5a..bb814c95 100755
--- a/tartufo/scanner.py
+++ b/tartufo/scanner.py
@@ -388,10 +388,11 @@ def _iter_diff_index(
         """
         diff: git.Diff
         for diff in diff_index:
+            file_path = diff.b_path if diff.b_path else diff.a_path
             printable_diff: str = diff.diff.decode("utf-8", errors="replace")
             if printable_diff.startswith("Binary files"):
+                self.logger.debug("Binary file skipped: %s", file_path)
                 continue
-            file_path = diff.b_path if diff.b_path else diff.a_path
             if self.should_scan(file_path):
                 yield (printable_diff, file_path)